Supplemental Disclosure of Cash Flow Information: Supplemental Disclosure of Cash Flow Information: Non Cash Transactions: Non-Cash Transactions: Non-Cash Investing and Financing Activities: Consolidated Balance Sheets [Parentheticals] CONSOLIDATED BALANCE SHEETS [Parentheticals] Consolidated Statements of Income [Parentheticals] CONSOLIDATED STATEMENTS OF INCOME [Parentheticals] Consolidated Statements of Cash Flows [Parentheticals] CONSOLIDATED STATEMENTS OF CASH FLOWS [Parentheticals] This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization, combined with, for an unclassified balance sheet, the carrying amount (net of accumulated amorti zation) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Deferred Leasing And Financing Costs Net Of Accumulated Amortization Deferred leasing and financing costs, net of accumulated amortization of $223,131 and $182,106 Including the current and noncurrent portions, carrying amount of debt identified as being exchangeable into another form of financial instrument (typically the entity's common stock) as of the balance-sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. Exchangeable senior debentures Exchangeable senior debentures Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Income before income taxes Income loss before income taxes Income before income taxes (Loss) income before income taxes Conversion of preferred shares Conversion Of Series Preferred Shares To Common Shares Conversion of Series A preferred shares to common shares, value Conversion of Series A preferred shares to common shares, value Accelerated amortization of equity awards surrendered Write Off Of Unamortized Costs From Voluntary Surrender Of Equity Awards Stock option awards expense Unamortized Portion Of Awards Expensed For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income, combined with, for an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period. Deferred Leasing And Financing Costs Amortization Deferred leasing and financing costs, accumulated amortization Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations, and other real estate revenue not otherwise specified in the taxonomy. Fees And Other Income Fee and other income Fee and other income The valuation allowance to reduce the amount of Mezzanine Loans receivables to estimated net realizable value. Mezzanine loans loss accrual (reversal) Mezzanine loans loss (reversal) accrual The valuation allowance as of the balance sheet date to reduce the gross amount of straight-line rent receivables receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet Receivables Arising From Straight Lining Of Rents Allowance Receivable arising from the straight-lining of rents, allowance This element represents an adjustment to other comprehensive income for the equity method share. Our share of partially owned entities OCI adjustments Our share of partially owned entities OCI adjustments The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Net Income Loss Equity Net income (loss) Net income (loss) Redeemable Noncontrolling Interests [Abstract] Redeemable Noncontrolling Interests [Abstract] This item represents disclosure of the amount of capital distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. Distributions of capital from partially owned entities Interest and Other Investment (Loss) Income, net [Abstract] Interest and Other Investment (Loss) Income, net [Abstract] The cash inflow from securities or other assets sold, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Proceeds from maturing short-term investments Organization and Business [Abstract] Organization and Business [Abstract] Basis of Presentation and Significant Accounting Policies [Abstract] Basis of Presentation and Significant Accounting Policies [Abstract] Investments in Partially Owned Entities [Abstract] Investments in Partially Owned Entities [Abstract] Recently Issued Accounting Literature [Abstract] Recently Issued Accounting Literature [Abstract] Mezzanine Loans Receivable [Abstract] Mezzanine Loans Receivable [Abstract] Identified Intangible Assets and Liabilities [Abstract] Identified Intangible Assets and Liabilities [Abstract] Debt [Abstract] Debt [Abstract] Discontinued Operations [Abstract] Discontinued Operations [Abstract] Stock-based Compensation [Abstract] Stock-based Compensation [Abstract] Stock-based Compensation [Abstract] Fee and Other Income [Abstract] Fee and Other Income [Abstract] Income Per Share [Abstract] Income Per Share [Abstract] Comprehensive Income [Abstract] Comprehensive Income [Abstract] Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Retirement Plans [Abstract] Retirement Plans [Abstract] Retirement Plan [Abstract] Segment Information [Abstract] Segment Information [Abstract] Fair Value Measurements [Abstract] Fair Value Measurements [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Increase (decrease) in retained earnings associated with the repurchase of shares related to stock compensation arrangements and associated employee tax withholdings. Repurchase of shares related to stock compensation arrangements and related tax withholdings Repurchase of shares related to stock compensation agreements and related tax withholdings Redeemable noncontrolling interests units outstanding - Series D [member] Redeemable noncontrolling interests units outstanding - Series D [Member] Balance, shares Balance, shares Ending balance, shares Beginning balance, shares Unit distributions paid in Class A units Unit distributions paid in Class A units Unit distributions paid in Class A units Purchase of outstanding preferred units Purchase Of Outstanding Preferred Units Purchase of outstanding preferred units and shares Net gain resulting from Lexington Realty Trust stock issuance Net gain resulting from Lexington Realty Trust stock issuance Net gain resulting from Lexington Realty Trust stock issuance Net gain resulting from Lexington Realty Trust's March 2010 stock issuance Class A units Class Units Class A units - 12,804,202 and 13,892,313 units outstanding Class A units Series D cumulative redeemable preferred units Series D cumulative redeemable preferred units Series D cumulative redeemable preferred units - 10,400,001 and 11,200,000 units outstanding Impairment and other losses Impairment and other losses Impairment and other losses Impairment losses and aquisition costs Litigation loss accrual and acquisition costs Redeemable noncontrolling interests units outstanding - Class A [member] Redeemable Noncontrolling Interests Units Outstanding Class Member Redeemable noncontrolling interests units outstanding - Class A [Member] Toys R Us' fourth quarter net income as a percentage of its yearly net income Percent Income Fourth Quarter Equity Method Investee Toy's fourth quarter fiscal year net income Toys R Us [Member] Toys R Us [Member] Alexanders Inc Alexanders Inc [Member] Equity Method Investment Fair Value In Excess Of Carrying Amount Equity Method Investment Fair Value In Excess Of Carrying Amount Excess of investee's fair value over carrying amount Lexington Realty Trust [Member] Lexington Realty Trust [Member] Equity Method Investment Common Shares Ownership Equity Method Investment Common Shares Ownership Ownership common shares, investee Ownership common shares, Lexington Equity Method Investment Acquisition Of Additional Common Shares Equity Method Investment Acquisition Of Additional Common Shares Additional common shares acquired in Lexington Partially Owned Office Buildings Partially owned office buildings [Member] India real estate ventures India real estate ventures [Member] Other equity method investments Other equity method investments [Member] This item represents the proportionate share of net income, before taxes from an equity method investment Equity Method Investment Equity In Net Income Before Income Taxes Equity in net income, before income taxes This item represents the proportionate share of income taxes from an equity method investment Equity Method Investment Income Tax Expense Income tax expense Income tax expense This item represents a proportionate share of net income of an equity method investee. Equity Method Investment Equity In Net Income Equity in net income This item represents the proportionate share of interest and other income, from a equity method investment Equity Method Investment Interest And Other Income Interest and other income Equity Method Investment Equity In Net Income Before Stock Appreciation Rights Equity Method Investment Equity In Net Income Before Stock Appreciation Rights Equity in net income before stock appreciation rights Equity Method Investment Reversal Of Stock Appreciation Rights Compensation Expense Equity Method Investment Reversal Of Stock Appreciation Rights Compensation Expense Reversal of stock appreciation rights compensation expense Reversal of stock appreciation rights compensation expense Equity Method Investment Management And Leasing Fees Equity Method Investment Management And Leasing Fees Management and leasing fees Equity Method Investment Development Fees Equity Method Investment Development Fees Development Fees Equity Method Investment Debt Of Partially Owned Entities Equity Method Investment Debt Of Partially Owned Entities Senior Unsecured Notes at 10.75% Due 2017 [Member] Senior Unsecured Notes At 1075 Due 2017 [Member] 10.75% senior unsecured notes, due 2017 (Face value - $950,000) [Member] Senior Unsecured Notes at 8.50% Due 2017 [Member] Senior Unsecured Notes At 850 Due 2017 Member 8.50% senior unsecured notes, due 2017 (Face value $725,000) [Member] Credit Facility Member Credit Facility 1.6 Billion [Member] Senior UK Real Estate Facility [Member] Senior Uk Real Estate Facility [Member] Bonds 7.625%[Member] Bonds 7625 Member 7.625% bonds, due 2011 (Face value - $500,000) [Member] Senior Notes 7.875% [Member] Senior Notes 7875 Member 7.875% senior notes, due 2013 (Face value - $400,000) [Member] Senior Notes 7.375% [Member] Senior Secured Notes7375 [Member] Spanish Real Estate Facility [Member] Spanish Real Estate Facility Member 4.51% Spanish real estate facility, due 2013 [Member] Unsecured Term Loan Facility $181 Million [Member] Unsecured Term Loan Facility 181 Million Member $181 million unsecured term loan facility, due 2013, LIBOR plus 5.00% (5.35% at June 30, 2010) [Member] Japan Bank Loans [Member] Japan Bank Loans Member Japan bank loans, due 2011 - 2014, 1.20% - 2.85% [Member] French Real Estate Facility [Member] French Real Estate Facility Member 4.51% French real estate facility, due 2013 [Member] Debentures 8.750% [Member] Debentures 8750 Member 8.750% debentures, due 2021 (Face value - $22,000) [Member] Mortgage Loan [Member] Mortgage Loan Member Mortgage loan, due 2010, LIBOR plus 1.30% [Member] Japan Borrowings [Member] Japan Borrowings Member Japan borrowings, due 2011 [Member] European and Australian Asset Based Revolving Credit Facility [Member] European And Australian Asset Based Revolving Credit Facility Member European and Australian asset-based revolving credit facility, due 2012, LIBOR/EURIBOR plus 4.00% [Member] Lexington Avenue Mortgage Office Space [Member] Lexington Avenue Mortgage Office Space Member 731 Lexington Avenue mortgage note payable collateralized by the office space, due in February 2014, with interest at 5.33% (prepayable without penalty after December 2013) [Member] Lexington Avenue Mortgage Retail Space [Member] Lexington Avenue Mortgage Retail Space Member 731 Lexington Avenue mortgage note payable, collateralized by the retail space, due in July 2015, with interest at 4.93% (prepayable without penalty after December 2013) [Member] Rego Park Construction [Member] Rego Park Construction Member Rego Park construction loan payable, due in December 2010, LIBOR plus 1.20% (1.55% at June 30, 2010) [Member] Kings Plaza Regional Shopping Center Mortgage [Member] Kings Plaza Regional Shopping Center Mortgage [Member] Kings Plaza Regional Shopping Center mortgage note payable, due in June 2011, with interest at 7.46% (prepayable without penalty after December 2010) [Member] Rego Park Mortgage [Member] Rego Park Mortgage Member Rego Park mortgage note payable, due in March 2012 (prepayable without penalty) [Member] Paramus Mortgage [Member] Paramus Mortgage Member Paramus mortgage note payable, due in October 2011, with interest at 5.92% [Member] Kaempfer Properties [Member] Kaempfer Properties Member Kaempfer Properties (2.5% and 5.0% interests in two partnerships) mortgage notes payable, collateralized by the partnerships' real estate, due 2011, with a weighted average interest rate of 5.85% at June 30, 2010 (various prepayment terms) [Member] Van Ness San Francisco Office Complex [Member] Van Ness San Francisco Office Complex Member 100 Van Ness, San Francisco office complex (9% interest) up to $132 million construction loan payable, due in July 2013, LIBOR plus 2.75% (3.10% at June 30, 2010) with an interest rate floor of 6.50% and interest rate cap of 7.00% [Member] Madison Avenue [Member] Madison Avenue Member 330 Madison Avenue (25% interest) $150,000 mortgage note payable, due in June 2015, LIBOR plus 1.50% (1.87% at June 30, 2010) [Member] Fairfax Square [Member] Fairfax Square Member Fairfax Square (20% interest) mortgage note payable, due in December 2014, with interest at 7.00% (prepayable without penalty after July 2014) Member Rosslyn Plaza [Member] Rosslyn Plaza Member Rosslyn Plaza (46% interest) mortgage note payable, due in December 2011, LIBOR plus 1.0% (1.34% at June 30, 2010) [Member] West 57th Street [Member] West 57th Street Member West 57th Street (50% interest) mortgage note payable, due in February 2014, with interest at 4.94% (prepayable without penalty) [Member] Seventh Avenue [Member] Seventh Avenue Member 825 Seventh Avenue (50% interest) mortgage note payable, due in October 2014, with interest at 8.07% (prepayable without penalty after April 2014) [Member] TCG Urban Infrastructure Holdings [Member] Tcg Urban Infrastructure Holdings Member TCG Urban Infrastructure Holdings (25% interest) mortgage notes payable, collateralized by the entity's real estate, due from 2010 to 2022, with a weighted average interest rate of 12.78% at June 30, 2010 (various prepayment terms) [Member] India Property Fund LP [Member] India Property Fund Lp Member India Property Fund L.P. (36.5% interest) revolving credit facility, repaid upon maturity in March 2010 [Member] Waterfront Associates LLC [Member] Waterfront Associates Llc Member Waterfront Associates, LLC (2.5% interest) construction and land loan up to $250 million payable, due in September 2011 with a six month extension option, LIBOR plus 2.00% - 3.50% (2.56% at June 30, 2010) [Member] Verde Realty Operating Partnership [Member] Verde Realty Operating Partnership Member Verde Realty Operating Partnership (8.3% interest) mortgage notes payable, collateralized by the partnerships' real estate, due from 2010 to 2025, with a weighted average interest rate of 5.85% at June 30, 2010 (various prepayment terms) [Member] Green Courte Real Estate Partners LLC [Member] Green Courte Real Estate Partners Llc Member Green Courte Real Estate Partners, LLC (8.3% interest) (as of December 31, 2009 and September 30, 2009), mortgage notes payable, collateralized by the partnerships' real estate, due from 2010 to 2018, with a weighted average interest rate of 5.29% at June 30, 2010 (various prepayment terms) [Member] Monmouth Mall [Member] Monmouth Mall Member Monmouth Mall (50% interest) mortgage note payable, due in September 2015, with interest at 5.44% (prepayable without penalty after July 2015) [Member] San Jose California Ground Up Development [Member] San Jose California Ground Up Development Member San Jose, California Ground-up Development (45% interest) construction loan, due in March 2013, 2010 [Member] Wells/Kinzie Garage [Member] Wells Kinzie Garage Member Wells/Kinzie Garage (50% interest) mortgage note payable, due in December 2013, with interest at 6.87% [Member] Orleans Hubbard Garage [Member] Orleans Hubbard Garage [Member] Orleans Hubbard Garage (50% interest) mortgage note payable, due in December 2013, with interest at 6.87% [Member] Other Investments [Member] Other Investments [Member] Spread Over LIBOR Minimum Spread Over LIBOR Minimum Spread Over LIBOR Maximum Spread Over LIBOR Maximum Spread Over LIBOR Spread Over LIBOR Mezzanine Loan Receivable Maturity Date Mezzanine Loan Receivable Maturity Date Mezzanine Loan Receivable - Maturity Date Riley Hold Co Corp [Member] Riley Hold Co Corp [Member] Tharaldson Lodging Companies [Member] Tharaldson Lodging Companies [Member] Park Avenue [Member] Park Avenue Member 280 Park Avenue [Member] Other Net [Member] Other, net [Member] Equinox [Member] Equinox [Member] Below Market Leases Net Of Above Market Leases [Member] Below Market Leases Net Of Above Market Leases [Member] Other Identified Intangible Assets [Member] Other Identified Intangible Assets [Member] Tenant Under Ground Leases [Member] Tenant Under Ground Leases [Member] This element represents the identifiable intangible liability established upon acquisition based on an unfavorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. Finite Lived Intangible Liability Gross Identified intangible liabilities (included in deferred credit): Gross Identified intangible liabilities (included in deferred credit): Gross The accumulated amount of amortization of a major finite-lived intangible liability class. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Finite Lived Intangible Liability Accumulated Amortization Identified intangible liabilities (included in deferred credit): Accumulated amortization Identified intangible liabilities (included in deferred credit): Accumulated amortization The aggregate sum of gross carrying value of a major finite-lived intangible liabilty class, less accumulated amortization. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company Identified intangible liabilities (included in deferred credit): Net Net Identified intangible liabilities (included in deferred credit): Net Finite Lived Intangible Liabilities Net New York Office 1290 Avenue Of The Americas [Member New York Office 1290 Avenue Of Americas Member New York Office 1290 Avenue Of The Americas [Member] New York Office 350 Park Avenue [Member] New York Office 350 Park Avenue [Member] New York Office 770 Broadway [Member] New York Office 770 Broadway [Member] New York Office 888 Seventh Avenue [Member] New York Office 888 Seventh Avenue [Member] New York Office Two Penn Plaza [Member] New York Office Two Penn Plaza [Member] New York Office 909 Third Avenue [Member] New York Office 909 Third Avenue [Member] New York Office Eleven Penn Plaza [Member] New York Office Eleven Penn Plaza [Member] Washington DC Office Skyline Place [Member] Washington DC Office Skyline Place [Member] Washington DC Office Warner Building [Member] Washington DC Office Warner Building [Member] Washington DC Office River House Apartments [Member] Washington DC Office River House Apartments [Member] Washington DC Office 1215 Clark Street, 200 12th Street And 251 18th Street [Member] Washington DC Office 1215 Clark Street, 200 12th Street And 251 18th Street [Member] Washington DC Office Bowen Building [Member] Washington DC Office Bowen Building [Member] Washington DC Office Reston Executive I, II, And III [Member] Washington DC Office Reston Executive I, II, And III [Member] Washington DC Office Reston Executive Washington DC Office 1101 17th, 1140 Connecticut, 1730 M And 1150 17th Street [Member] Washington DC Office 1101 17th, 1140 Connecticut, 1730 M And 1150 17th Street [Member] Washington DC Office 1550 And 1750 Crystal Drive [Member] Washington DC Office 1550 And 1750 Crystal Drive [Member] Washington DC Office Universal Buildings [Member] Washington DC Office Universal Buildings [Member] Washington DC Office 1235 Clark Street [Member] Washington DC Office 1235 Clark Street [Member] Washington DC Office 1235 S. Clark Street [Member] Washington DC Office 2231 Crystal Drive [Member] Washington DC Office 2231 Crystal Drive [Member] Washington DC Office 1750 Pennsylvania Avenue [Member] Washington DC Office 1750 Pennsylvania Avenue [Member] Washington DC Office 241 18th Street [Member] Washington DC Office 241 18th Street [Member] Washington DC Office 2011 Crystal Drive [Member] Washington DC Office 2011 Crystal Drive [Member] Washington DC Office 1225 Clark Street [Member] Washington DC Office 1225 Clark Street [Member] Washington DC Office 1800, 1851 And 1901 South Bell Street [Member] Washington DC Office 1800, 1851 And 1901 South Bell Street [Member] Retail Springfield Mall [Member] Retail Springfield Mall [Member] Retail VA Springfield Mall [Member] Retail Montehiedra Town Center [Member] Retail Montehiedra Town Center [Member] Retail PR Montehiedra Town Center [Member] Retail Broadway Mall [Member] Retail Broadway Mall [Member] Retail 828-850 Madison Avenue Condominium [Member] Retail 828-850 Madison Avenue Condominium [Member] Retail Las Catalinas Mall [Member] Retail Las Catalinas Mall [Member] Retail PR Las Catalinas Mall [Member] Merchandise Mart [Member] Merchandise Mart [Member] Merchandise Mart High Point Complex [Member] Merchandise Mart High Point Complex [Member] Merchandise Mart NC High Point Complex [Member] Merchandise Mart Boston Design Center [Member] Merchandise Mart Boston Design Center [Member] Merchandise Mart MA Boston Design Center [Member] Merchandise Mart Washington Design Center [Member] Merchandise Mart Washington Design Center [Member] Merchandise Mart DC Washington Design Center [Member] Other 555 California Street [Member] Other 555 California Street [Member] Other Industrial Warehouses [Member] Other Industrial Warehouses [Member] New York Office Manhattan Mall [Member] New York Office Manhattan Mall [Member] New York Office 866 UN Plaza [Member] New York Office 866 UN Plaza [Member] Washington DC Office 2101 L Street [Member] Washington DC Office 2101 L Street [Member] Washington DC Office 220 20th Street [Member] Washington DC Office 220 20th Street [Member] Washington DC Office West End 25 [Member] Washington DC Office West End 25 [Member] Retail Green Acres Mall [Member] Retail Green Acres Mall [Member] Retail Bergen Town Center [Member] Retail Bergen Town Center [Member] Retail NJ Paramus (Bergen Town Center) [Member] Retail Beverly Connection [Member] Retail Beverly Connection [Member] Retail CA Beverly Connection [Member] Retail 4 Union Square South [Member] Retail 4 Union Square South [Member] Retail 435 Seventh Avenue [Member] Retail 435 Seventh Avenue [Member] Retail Other [Member] Retail Other [Member] Other 220 Central Park South [Member] Other 220 Central Park South [Member] Other Other [Member] Other Other [Member] Senior Unsecured Notes Due 2015 [Member] Senior Unsecured Notes Due 2015 [Member] Senior Unsecured Notes Due 2039 [Member] Senior Unsecured Notes Due 2039 [Member] Senior Unsecured Notes Due 2010 [Member] Senior Unsecured Notes Due 2010 [Member] Senior Unsecured Notes Due 2011 [Member] Senior Unsecured Notes Due 2011 [Member] Exchangeable Senior Debenture 3.88% Due 2025 [Member] Exchangeable Senior Debenture 3.88% Due 2025 [Member] Convertible Senior Debenture 2.85% Due 2027 [Member] Convertible Senior Debenture 2.85% Due 2027 [Member] $1.4 Billion Convertible Senior Debenture 2.85% Due 2027 [Member] Convertible Senior Debenture 3.63% Due 2026 [Member] Convertible Senior Debenture 3.63% Due 2026 [Member] $1 Billion Convertible Senior Debenture 3.63% Due 2026 [Member] Unsecured Revolving Credit Facility $1.595 Billion [Member] Unsecured Revolving Credit Facility $1.595 Billion [Member] Unsecured Revolving Credit Facility $1.000 Billion [Member] Unsecured Revolving Credit Facility 965 Billion Member Unsecured Revolving Credit Facility $1.000 Billion [Member] This element represents the disclosure related to the convertible and exchangeable senior debentures Disclosures Of Convertible And Exchangeable Senior Debentures Balance Sheet Schedule Debt Disclosures Of Convertible And Exchangeable Senior Debentures Income Statement Schedule Disclosures Of Convertible And Exchangeable Senior Debentures Income Statement Schedule Disclosures of convertible and exchangeable senior debentures Unsecured Revolving Credit Facility Reserved For Outstanding Letters Of Credit Unsecured Revolving Credit Facility Reserved For Outstanding Letters Of Credit Coupon Interest Of Debt Discount Premium Coupon Interest Of Debt (Discount) Premium Discount Amortization Original Of Debt (Discount) Premium Discount Amortization Original Of Debt (Discount) Premium Discount Amortization ASC470-20 Of Debt (Discount) Premium Discount Amortization ASC470-20 Of Debt (Discount) Premium Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Redeemable Noncontrolling Interests [Text Block] Redeemable Noncontrolling Interests [Text Block] Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests Policy [Text Block] Redeemable Noncontrolling Interests Policy [Text Block] Redeemable Noncontrolling Interests Policy Summary Of Activity Of Redeemable Noncontrolling Interests [Text Block] Summary Of Activity Of Redeemable Noncontrolling Interests [Text Block] Summary Of Activity Of Redeemable Noncontrolling Interests Net Income Loss Attributable To Redeemable Noncontrolling Interest Net Income Loss Attributable To Redeemable Noncontrolling Interest Net income Distributions Attributable To Redeemable Noncontrolling Interest Distributions Attributable To Redeemable Noncontrolling Interest Distributions Distributions Other Net Attributable To Redeemable Noncontrolling Interest Other Net Attributable To Redeemable Noncontrolling Interest Other, net Class A Units Redemption Value Class Units Redemption Value Class A Units redemption value This item represent the total redemption amount for units redeemed Cumulative Redeemable Preferred Units Redemption Amount Cumulative Redeemable Preferred Units Redemption Amount This item represent the gain or loss associated with the redemption of Series D-12 unit Net Gain On Redemption Of Cumulative Redeemable Preferred Units This element represents the schedule of carrying amounts and fair values of the financial assets and liabilities that are not measured at fair value in our consolidated financial statement. Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Text Block] Schedule Of Carrying Amounts And Fair Values Of Financial Instruments Sum Of Financial Assets Measured At Market Value Sum Of Financial Assets Measured At Market Value Total assets Mandatorily Redeemable Instruments Included In Other Liabilities Mandatorily Redeemable Instruments Included In Other Liabilities Mandatorily redeemable instruments (included in other liabilities) Disposal Group Including Discontinued Operation Total Expenses Disposal Group Including Discontinued Operation Total Expenses Total expenses This item represents the details of revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations, and all other real estate revenue not otherwise specified in the taxonomy. Schedule Of Fee And Other Income [Text Block] Fee and Other Income (Table) This item represents the fees earned from providing cleaning services to the tenants. Tenant Cleaning Fees Tenant cleaning fees This item represents the revenue earned from the management of joint ventures, managing third-party properties, or another entity's operations and revenues earned from leasing space for third-party properties. Management And Leasing Fees Management and leasing fees This item represents the revenue received due to early termination of leases. Lease Termination Fees Lease termination fees Schedule of revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations, and other real estate revenue not otherwise specified in the taxonomy. Fee and Other Income [Text Block] Fee and Other Income Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations, and other real estate revenue not otherwise specified in the taxonomy. Fee and Other Income Total fee and other income Total Fee and Other Income Total Fee and Other Income Schedule Of Earnings Per Share Basic And Diluted [Text Block] Schedule Of Earnings Per Share Basic And Diluted [Text Block] Schedule of Reconciliation of Income Per Share (Table) This item represents the dividends paid to unvested participating securities. Earnings Allocated To Unvested Participating Securities Earnings allocated to unvested participating securities Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period) and earnings allocated to participating securties. Numerator For Basic Income Per Share Numerator for basic income (loss) per share Weighted Average Number Diluted Shares Outstanding Adjustment Employee Stock Options And Restricted Share Awards Weighted Average Number Diluted Shares Outstanding Adjustment Employee Stock Options And Restricted Share Awards Employee stock options and restricted share awards Schedule Of Comprehensive Income Table [Text Block] Schedule Of Comprehensive Income Table [Text Block] Comprehensive Income (Loss) (Table) Amount of all risk and rental value insurance coverage against damages to property. All Risk And Rental Value [Member] Amount of insurance coverage against damages to property caused by earthquakes in California. Earthquake California Properties [Member] Amount of insurance coverage against damages to property caused by acts of terrorism including nuclear, biological, chemical and radiological acts as defined by TRIA. NBCR Losses [Member] Estimated loss accrual relating to the H Street building Corporation litigation settlement. Loss Accrual Regarding Lawsuit Loss accrual regarding H Street decision Relating to the lawsuit with tenancy in the land in Arlington County, Virginia. H Street [Member] Sales Price Ruled By Trial Court Sales Price Ruled By Trial Court Sales price of H Street ruled by trial court Damages claimed in suit against Vornado regarding H Street Damages Claimed In Suit Against Registrant Damages claimed in suit against Vornado regarding H Street Additional tenancy in common interest in land, Arlington County, Virginia, acquired by H Street Additional Tenancy In Common Interest In Land Acquired Additional tenancy in common interest in land, Arlington County, Virginia, acquired by H Street Tenancy in common interest in land, Arlington County, Virginia, owned by H Street Tenancy In Common Interest In Land Tenancy in common interest in land, Arlington County, Virginia, owned by H Street Remaining limited partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex owned by Donald Trump Remaining Limited Partnership Interest Owned by Other Parties Remaining limited partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex owned by Donald Trump Relating to the ownership of Avenue of the Americas 1290 and 555 California Street Complex, which are subject to some disputed by Donald J Trump Avenue Of Americas 1290 And 555 California Street Complex Member Remaining limited partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex owned by Donald Trump Avenue of the Americas 1290 and 555 California Street Complex [Member] Limited partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex Limited Partnership Interest Owned By Registrant Limited partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex Sole general partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex Sole General Partnership Interest Owned By Registrant Sole general partnership interest in the partnerships that own 1290 Avenue of the Americas and 555 California Street complex Controlling interest, 1290 Avenue of the Americas and 555 California Street complex Controlling Interest Owned By Registrant Controlling interest, 1290 Avenue of the Americas and 555 California Street complex Relating to Stop & Shop and the complaint filed with the United States District Court for the District of New Jersey about the collection of annual rent. Stop & Shop [Member] Stop & Shop complaint regarding rent allocated to East Brunswick, Jersey City, Middletown, Union, and Woodbridge leases Complaint Regarding Rent Allocation Stop & Shop complaint regarding rent allocated to East Brunswick, Jersey City, Middletown, Union, and Woodbridge leases Stop & Shop complaint regarding annual rent collected pursuant to Master Agreement and Guaranty Complaint Regarding Annual Rent Stop & Shop complaint regarding annual rent collected pursuant to Master Agreement and Guaranty Approximate amount of the commitment to fund Central Park South project Commitment to Fund Additional Capital to Partially Owned Entities Commitment to fund additional capital to partially owned entities Commitment to fund Central Park South project, low end of range Commitment To Fund Project Low End Of Range Commitment to fund Central Park South project, low end of range Commitment to fund Central Park South project, high end of range Commitment To Fund Project High End Of Range Commitment to fund Central Park South project, high end of range Relating to the development of the property at 220 Central Park South. Central Park South 220 [Member] An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation. Letters of Credit Outstanding letters of credit Guarantees And Master Leases Guarantees And Master Leases Guarantees and master leases Federal Government Deductible Percentage Of Balance Of A Covered Loss Federal Government Deductible Percentage Of Balance Of Covered Loss Federal government deductible, percentage of balance of a covered loss Federal Government Deductible, Percentage Of Balance Of A Covered Loss Insurance Limit Per Occurrence Insurance Limit Per Occurrence Insurance limit per occurrence Vornado deductible, annual aggregate Registrant Deductible Annual Aggregate Vornado deductible, annual aggregate Vornado deductible, percentage of property value Registrant Deductible Percentage Of Property Value Vornado deductible, percentage of property value Schedule Of Details Of Other EBITDA [Text Block] Schedule Of Details Of Other EBITDA [Text Block] Details of Other EBITDA (Table) Domain member used to indicate facts reported for the Other Segment Other Segment [Member] Domain member used to indicate facts reported for the Retail Segment. Retail [Member] Domain member used to indicate facts reported for the Washington, DC Office Segment. Washington DC Office [Member] Domain member used to indicate facts reported for the New York Office Segment. New York Office [Member] This element represent the straight lined rental income for the contractual rent increases through the period of the lease. Contractual Rent Increases Contractual rent increases This element represent the straight lined rental income (expense) for the amortization of free rent. Amortization Of Free Rent Amortization of free rent This element represents the earnings before interest, taxes, depreciation and amortization. Earnings Before Interest, Taxes, Depreciation, and Amortization EBITDA EBITDA Domain member used to indicate facts reported for the continuing operations of 555 California Street. California Street 555 [Member] 555 California Street [Member] 555 California Street [Member] Domain member used to indicate facts reported for the continuing operations of Industrial Warehouses. Industrial Warehouses [Member] Domain member used to indicate facts reported for the continuing operations of Hotel Pennsylvania. Hotel Pennsylvania [Member] Investment income and other, excluding mark-to-market of deferred compensation plan assets and offsetting liability. Investment Income And Other Excluding Mark To Market Of Deferred Compensation Plan Assets And Offsetting Liability [Member] Corporate general and administrative expenses, excluding mark-to-market of deferred compensation plan assets and offsetting liability. Corporate General And Administrative Expenses Excluding Mark To Market Of Deferred Compensation Plan Assets And Offsetting Liability [Member] Net (income) loss attributable to noncontrolling interests, including unit distributions. Net (income) loss attributable to noncontrolling interests, including unit distributions [Member] Write-off of unamortized costs from the voluntary surrender of equity awards. Write Off Of Unamortized Costs From Voluntary Surrender O fEquity Awards Member Write Off Of Unamortized Costs From The Voluntary Surrender Of Equity Awards [Member] Income Tax expense (benefit) including the proportionate share of partailly owned entities. Income Tax Expense Including Partially Owned Entities Income tax (benefit) expense (2) Income tax (benefit) expense excluded from EBITDA Depreciation and Amortization expense including the proportionate share of partailly owned entities Depreciation And Amortization Including Partially Owned Entities Depreciation and amortization (2) Depreciation and amortization excluded from EBITDA Interest and debt related expenses including the proportionate share of partailly owned entities. Interest And Debt Expense Including Partially Owned Entities Interest and debt expense (2) Interest and debt expense excluded from EBITDA Mezzanine Loans Receivable [Member] Mezzanine Loans Receivable [Member] Notes And Mortgages Payable Fixed Rate [Member] Notes And Mortgages Payable Fixed Rate [Member] Notes And Mortgages Payable Variable Rate [Member] Notes And Mortgages Payable Variable Rate [Member] Exchangeable Senior Debentures [Member] Exchangeable Senior Debentures [Member] Convertible Senior Debentures [Member] Convertible Senior Debentures [Member] Unsecured Revolving Credit Facilities [Member] Unsecured Revolving Credit Facilities [Member] The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. Debt Instrument Convertible Conversion Price Per Share Conversion price per share, as adjusted Number of shares on which the aggregate consideration to be delivered upon conversion is determined Selling Price As Percentage Of Face Value Selling Price As Percentage Of Face Value Notes Selling Price as Percentage of Face Amount Proceeds From Public Offering Of Unsecured Debt Proceeds From Public Offering Of Unsecured Debt Retained net proceeds from Public offering DeferredFinancingCostsWereReclassified To Deferred Leasing And Financing Costs Deferred Financing Costs Reclassified To Deferred Leasing And Financing Costs Deferred financing costs Reclassified to deferred leasing and financing costs LIBOR Floor LIBOR Floor Spread Over Freddie Mac Interest Rate Spread Over Freddie Mac Interest Rate Spread over Freddie Mac Interest Rate Construction Loan Extended [Member] Construction Loan Extended [Member] Loan Under Negotiation [Member] Loan Under Negotiation [Member] Cumulative Redeemable Preferred Units Redemption Price Per Unit Cumulative Redeemable Preferred Units Redemption Price Per Unit Cumulative Redeemable Preferred Units Redeemed Cumulative Redeemable Preferred Units Redeemed Cumulative Redeemable Preferred units redeemed Mezzanine Loans Receivable: Interest Rate Range Minimum Mezzanine Loans Receivable - Interest Rate Range Minimum Mezzanine Loans Receivable: Interest Rate Range Maximum Mezzanine Loans Receivable: Interest Rate Range Maximum Mezzanine Loans Receivable - Interest Rate Range Maximum Mezzanine Loan Receivable Interest Rate Mezzanine Loan Receivable Interest Rate Mezzanine Loan Receivable - Interest Rate Debt Instrument Maturity Date (String) Debt Instrument Maturity Date (String) Debt Instrument Maturity Kaempfer 1st Partnership 2.5% [Member] Kaempfer 1st Partnership 2.5% [Member] Kaempfer 2nd Partnership 5.0% [Member] Kaempfer 2nd Partnership 5.0% [Member] The cash inflow associated with principal repayment from a borrowing supported by a written promise to pay an obligation. Prepayment Of Mezzanine Loan Receivable Prepayment of Mezzanine Loan Receivable The total investment made in a Mezzanine Loan. Acquisition Cost Mezzanine Loan Acquisition cost, Mezzanine Loan Numerator for diluted income (loss) per share Numerator for diluted income (loss) per share Numerator for diluted income (loss) per share Costs of Acquisitions Not Consummated [Member] Costs of acquisitions not consummated [Member] Secured Term Loan Facility $800 Mllion [Member] Secured Term Loan Facility 800 Mllion Member $800 million secured term loan facility, due 2012, LIBOR plus 4.25% [Member] The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value recorded in prior periods. Prior Period Non Cash Impairment Charges Non-cash impairment charges West 34th Street [Member] West 34th Street Member 330 West 34th Street (34.8% interest) mortgage note payable [Member] Initial Equity Commitments Fund Initial Equity Commitments Fund Initial equity commitments for the Fund This element represents the total commitments to the real estate fund Vornado Equity Commitment Fund Vornado Total Equity Commitments For The Fund Expected Total Equity Commitment Fund Expected Total Equity Commitment Fund Total expected equity commitment fund Total expected equity commitments for the Fund Investment Period Fund Investment Period Fund Investment period for commitments of the Fund, years Fund Organization Costs Fund Organization Costs The Fund organization costs Anticipated Fund Organization Costs Anticipated Fund Organization Costs The Fund anticipated organization costs Basis of Presentation Policy [Text Block] Basis of Presentation Policy [Text Block] Basis of Presentation Policy Subsequent Events [Abstract] Subsequent Events [Abstract] Available For Sale Securities Unrealized Loss Available For Sale Securities Unrealized Loss Unrealized net (loss) on sale of securities available for sale Number of shares on which the aggregate consideration to be delivered upon conversion is determined Number Of Shares On Which Aggregate Consideration To Be Delivered Upon Conversion Is Determined Number of shares on which the aggregate consideration to be delivered upon conversion is determined Redeemable Non Controlling Interest [Abstract] Redeemable Non Controlling Interest [Abstract] Redeemable noncontrolling interests: Schedule of amounts representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. Mezzanine Loans Receivable [Text Block] Mezzanine Loans Receivable Schedule of amounts representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. Schedule Of Mezzanine Loans Receivable [Text Block] Mezzanine Loans Receivable (Table) Schedule of future amortization expense of intangible assets [Text Block] Schedule Of Future Amortization Expense Of Intangible Assets Liabilities [Text Block] Schedule of future amortization expense of intangible assets Redeemable Non Controlling Interests Redeemable Non Controlling Interests Redeemable Noncontrolling Interest Balance Total redeemable noncontrolling interests Total redeemable noncontrolling interests Adjustments to reflect redeemable Class A Operating Partnership units Adjustments To Reflect Redeemable Class Operating Partnership Units Adjustment to carry Class A redeemable units at redemption value Adjustment to carry Class A redeemable units at redemption value Conversion Of Class A Redeemable Units At Redemption Value Conversion Of Class Redeemable Units At Redemption Value Conversion of Class A redeemable units into common shares, at redemption value Conversion of Class A redeemable units into common shares, at redemption value Conversion Of Class A Redeemable Units At Redemption Value This item represents the Fee Income and Other Revenue earned from the management of properties owned by a related party during the period. Fee And Other Income From Related Parties Management fee income from Interstate Properties Mezzanine Loans Loss Accrual [Member] Mezzanine Loans Loss Accrual [Member] Other Investment Income [Member] Other Investment Income [Member] Mark to Market of deferred Compensation Plan [Member] Mark to Market of deferred Compensation Plan [Member] Marketable Securities [Member] Marketable Securities [Member] Litigation Loss Accrual Litigation Loss Accrual Litigation loss accrual Litigation loss accrual and impairment losses The percentage of ownership in the Mezzanine Loan Investment. Mezzanine Loan Ownership Percentage Ownership Interest in Mezzanine Loan Receivable LNR Property [Member] LNR Property [Member] Schedule Of Debt Of Partially Owned Entities [Text Block] Schedule Of Debt Of Partially Owned Entities [Text Block] Schedule of debt of partially owned entities Schedule Of Debt Of Partially Owned Entities Lease termination payment Lease termination payment Relating to Penn Plaza Insurance Company's re-insurance with respect to a portion of earthquake insurance coverage and insurance with respect to coverage for acts of terrorism as defined by TRIPRA. PPIC [Member] Insurance deductible Insurance deductible Insurance deductible, percentage of balance of a covered loss Insurance Deductible Percentage Of Balance Of Covered Loss Insurance deductible, percentage of balance of a covered loss Gain On Stock Issuance Gain on Stock Issuance Gain on stock issuance Downtown Crossing [Member] Downtown Crossing [Member] Washington DC 2200/2300 Clarendon Boulevard [Member] Washington DC 2200/2300 Clarendon Boulevard [Member] Mezzanine Loans Receivable Maturity Date Range Start Mezzanine Loans Receivable Maturity Date Range Start Mezzanine Loans Receiveable - Maturity Start Date Mezzanine Loans Receiveable - Maturity End Date Mezzanine Loans Receivable Maturity Date Range End Mezzanine Loans Receiveable - Maturity End Date Additional Equity Commitments Fund Additional Equity Commitments Fund Additional equity commitments for the Fund Number of Additional Retail Properties Sold Number of Additional Retail Properties Sold Number of additional retail properties sold Impairment Loss Impairment loss Real estate Fund organization costs [Member] Real estate Fund organization costs [Member] Net (loss) gain on early extinguishment of debt [Member] Net (loss) gain on early extinguishment of debt [Member] Other EBITDA Attributable to Identifiable Investments [Member] Other EBITDA attributable to identifiable investments [Member] Merchandise Mart Merchandise Mart [Member] Merchandise Mart Merchandise Mart [Member] Merchandise Mart IL Merchandise Mart, Chicago [Member] Equity Commitment Fund Term, in years Equity Commitment Fund Term Term of the Fund, years Real Estate Fund Details [Abstract] LNR [Member] LNR [Member] Schedule Of Long Term Debt Equity Method Investments [Line Items] Other Equity Method Investments Other [Member] Retail Cross Collateralized Mortgages On 40 Strip Shopping Centers [Member] Retail Cross Collateralized Mortgages On 40 Strip Shopping Centers [Member] Equity Method Investees Property Detail Name [Axis] Equity Method Investees Property Detail Name Domain Member Equity Method Investees Property Detail Name [Domain] quity Method Investees Property Detail Name Domain Member All Equity Method Investees Excluding Toys [Member] This member includes all equity method investees excluing Toys "R" Us. Real Estate Fund Non-depreciable Real Estate Real Estate Fund investments This element represents the real estate assets related to the fund Real Estate Fund investments Total Notes And Mortgages Payable Member Member This member represents all the members of the Notes and Mortgages payable Total Notes and Mortgages Payable [Member] Convertible Debt Gross his element represents the Principal amount of the debt component of the convertible and exchangeable senior debentures Principal Amount of Debt Component Toys R Us Segment [Member] Domain member used to indicate facts reported for the Toys R Us Segment Toys R Us Segment [Member] 04/13 Junior Uk Real Estate Facility Member Junior U.K. real estate facility, due 2013, with interest at 6.84% [Member] Noncontrolling Interest, Increase From Limited Partners' Contribution Real estate Fund Increase in noncontrolling interest balance due to the limited partners' contributions Income from Real Estate Fund (Loss) from Real Estate Fund (includes $805 of expenses that are attributable to noncontrolling interests) This element represents the income (loss) from the Real Estate Fund before allocation to noncontrolling interests Income from Real Estate Fund allocated to noncontrolling interests The portion of income (loss) from Real Estate Fund attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Loss from Real Estate Fund allocated to noncontrolling interests Real Estate Fund Investments Real Estate Fund Investments Real Estate Fund Investments This element represents the cash outflow associated with the Real Estate Fund's investments Amortization of discount on convertible and exchangeable senior debentures Amortization of discount on convertible and exchangeable senior debentures Capital Contributions from Partners [Axis] Capital Contributions from Partners [Axis] September 2010 [Member] September 2010 [Member] October 2010 [Member] October 2010 [Member] Total 2010 Contributions [Domain] Total 2010 Contributions [Domain] Investments Made By The Real Estate Fund [Axis] Investments Made By The Real Estate Fund [Axis] Real Estate Fund Two Investments [Member] Real Estate Fund Two Investments [Member] Real Estate Fund Third Investment [Member] Real Estate Fund Third Investment [Member] Investments Made By The Real Estate Fund [Domain] Investments Made By The Real Estate Fund [Domain] Reimbursement Of Fund Organization Costs Reimbusement to the company by the Fund for the portiion of it's Organization costs Number of shares acquired This element represents the number of common shares acquired during the reporting period JC Penney [Member] JC Penney [Member] Ownership Percentage The percentage of ownership of common stock in the investment Acquisiton Price Per Share The average per share cost of acquisition for the security Date [Domain] Transaction Date [Domain] Equity Method Investment Summarized Financial Information Appropriated Deficit This item represents the appropriated deficit for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. Appropriated deficit Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities Equity method investment pro rata share debt of partially owned entities excluding our pro rata share of LNR liabilities related to CMBS and CDO Transaction Date [Axis] Transaction Date [Axis] Derivative Instrument by Name [Axis] Derivative Instrument by Name [Axis] Shares Owned [Member] Shares Owned [Member] K Street 1999 [Member] 1999 K Street [Member] 1999 K Street [Member] Other real estate [Member] Derivative Positions in Marketable Equity Securities [Member] Derivative Positions in Marketable Equity Securities [Member] Purchases of marketable securities including J.C. Penney Company, Inc. common shares and other This element represents the total non cash investing activity for the J.C. Penney, Inc. transaction Washington DC Office Warner Building And 1101 17 th Street [Member] Washington DC Office Warner Building And 1101 17 th Street [Member] Washington DC Office 1101 17th Street [Member] Washington DC Office 1101 17th Street [Member] Percentage Common Ownership Sold This element represents the percentage of ownership interest that was sold in the investment Percentage Common Ownership Retained This element represents the common ownership percentage retained after a sale transaction Implied Fair Value of Real Estate Sold This element represents the implied fair value of real estate sold based on the sales contract Operating Income from Discontinued Operations This element represents the operating income from the properties that were sold or the income from discontinued operations before gains on sale of real estate Income from discontinued operations before gain on sale of real estate LNR Mortgage Notes Payable [Member] LNR mortgage notes payable [Member] Liabilities Of Consolidated CMBS And CDO Trusts [Member] Liabilities of consolidated CMBS and CDO trusts [Member Marketable Equity Securities Derivative Positions [Member] Marketable Equity Securities Derivative Positions [Member] FeeInterestObtainedUponForeclosure Fee interest obtained upon foreclosure Floating Rate Senior Unsecured Notes Due 2011 [Member] Floating Rate Senior Unsecured Notes Due 2011 [Member] Default Rate Additional Interest Expense Represents the excess default rate portion of interest incurred in the period on debt arrangements that are in default. Additional Interest Expense Accrued At Default Rate Face amount of debt purchased Face amount of debt purchased back Aggregate Carrying Amount Of Debt Purchased Aggregate Carrying Amount Of Debt Purchased Total contribution for LNR recapitalization This represents the total amount contributed by LNR's equity holders for its recapitalization. Debt after LNR recapitalization This amount represents the amount of debt remainging after LNR's recapitalization. Original debt before LNR recapitalization This represents the amount of debt before recapitalization. Company's contribution to the Fund This element represents the capital contribution by Vornado to the Real Estate Fund Vornado's contribution to the Real Estate Fund Unfunded Commitments to the Real Estate Fund This element represents the unfunded portion of the commitments to the Real Estate Fund Commitments To Investment Management Fund This element represents the commitment made relating to the investment management fund which will be managed by LNR New York Office One Penn Plaza [Member] New York Office One Penn Plaza [Member] New York Office 90 Park Avenue [Member] New York Office 90 Park Avenue [Member] New York Office 640 Fifth Avenue [Member] New York Office 640 Fifth Avenue [Member] New York Office 1740 Broadway [Member] New York Office 1740 Broadway [Member] New York Office 150 East 58th Street [Member] New York Office 150 East 58th Street [Member] New York Office 595 Madison Avenue [Member] New York Office 595 Madison Avenue [Member] New York Office 20 Broad Street [Member] New York Office 20 Broad Street [Member] New York Office 40 Fulton Street [Member] New York Office 40 Fulton Street [Member] New York Office 689 Fifth Avenue [Member] New York Office 689 Fifth Avenue [Member] New York Office 330 West 34th Street [Member] New York Office 330 West 34th Street [Member] New York Office 40 42 Thompson Street [Member] 40 42 Thompson Street [Member] 40-42 Thompson Street [Member] New York Office 1540 Broadway Garage [Member] New York Office 1540 Broadway Garage [Member] New York Office Other [Member] New York Office Other [Member] New York Office Total [Member] New York Office Total [Member] Washington DC Office 2011-2451 Crystal Drive [Member] Washington Dc Office 2011-2451 Crystal Drive [Member] Washington DC Office 2011-2451 Crystal Drive [Member] Washington DC Office 2001 Jefferson Davis Highway, 2100/2200 Crystal Drive, 223 23rd Street, 2221 South Clark Street, Crystal City Shops At 2100 And 220 20th Street [Member] Washington DC Office 2001 Jefferson Davis Highway 2100 2200 Crystal Drive 223 23rd Street 2221 South Clark Street Crysta lCity Shops At 2100 And 220 20th Street [Member] Washington DC Office 2001 Jefferson Davis Highway, 2100/2200 Crystal Drive, 223 23rd Street, 2221 South Clark Street, Crystal City Shops at 2100, 220 20th Street [Member] Washington DC Office 1550-1750 Crystal Drive/ 241-251 18th Street [Member] Washington DC Office 1550-1750 Crystal Drive 241-251 18th Street [Member] Washington DC Office 1550-1750 Crystal Drive/241-251 18th Street [Member] Washington DC Office 1215, 1225 S. Clark Street/ 200, 201 12th Street S. [Member] Washington DC Office 1215 1225 S Clark Street 200 201 12th Street S [Member] Washington DC Office 1215, 1225 S. Clark Street/200, 201 12th Street S. [Member] Washington DC Office 1229-1231 25th Street [Member] Washington DC Office 1229-1231 25th Street [Member] Washington DC Office 2200-2300 Courthouse Plaza [Member] Washington DC Office 2200-2300 Courthouse Plaza [Member] Washington DC Office 1875 Connecticut Avenue NW [Member] Washington DC Office 1875 Connecticut Avenue NW [Member] Washington DC Office One Skyline Tower [Member] Washington DC Office One Skyline Tower [Member] Washington DC Office H Street - North 10-1D Land Parce [lMember] Washington DC Office H Street - North 10-1D Land Parce [lMember] Washington DC Office 409 3rd Street [Member] Washington DC Office 409 3rd Street [Member] Washington DC Office 1825 Connecticut Avenue NW [Member] Washington DC Office 1825 Connecticut Avenue NW [Member] Washington DC Office Warehouses [Member] Washington DC Office Warehouses [Member] Washington DC Office Commerce Executive [Member] Washington DC Office Commerce Executive [Member] Washington DC Office Seven Skyline Place [Member] Washington DC Office Seven Skyline Place [Member] Washington DC Office 1150 17th Street [Member] Washington DC Office 1150 17th Street [Member] Washington DC Office Crystal City Hotel [Member] Washington DC Office Crystal City Hotel [Member] Washington DC Office H Street Ground Leases [Member] Washington DC Office H Street Ground Leases [Member] Washington DC Office 1227 25th Street [Member] Washington DC Office 1227 25th Street [Member] Washington DC Office 1140 Connecticut Avenue [Member] Wasington DC Office 1140 Connecticut Avenue [Member] Washington DC Office 1730 M.Street [Member] Washington DC Office 1730 M. Street [Member] Washington DC Office Democracy Plaza I [Member] Washington DC Office Democracy Plaza I [Member] Washington DC Office 1726 M Street [Member] Washington DC Office 1726 M Street [Member] Washington DC Office Crystal Drive Retail [Member] Washington DC Office Crystal Drive Retail [Member] Washington DC Office 1109 South Capitol Street [Member] Washington DC Office 1109 South Capitol Street [Member] Washington DC Office South Capitol [Member] Washington DC Office South Capitol [Member] Washington DC Office H-Street [Member] Washington DC Office H-Street [Member] Washington DC Other [Member] Washington DC Other [Member] Washington DC Office Total [Member] Washington DC Office Total [Member] Paramus Building [Member] Paramus Building [Member] Total Office Buildings [Member] Total Office Buildings [Member] Retail CA Sacramento [Member] Retail CA Sacramento [Member] Retail CA San Francisco (The Cannery) [Member] Retail CA San Francisco (The Cannery) [Member] Retail CA Walnut Creek (1149 S. Main Street) [Member] Retail CA Walnut Creek (1149 S. Main Street) [Member] Retail CA Pasadena [Member] Retail CA Pasadena [Member] Retail CA San Francisco (3700 Geary Blvd) [Member] Retail CA San Francisco (3700 Geary Blvd) [Member] Retail CA Signal Hill [Member] Retail CA Signal Hill [Member] Retail CA Walnut Creek (1556 Mount Diablo Blvd) [Member] Retail CA Walnut Creek (1556 Mount Diablo Blvd) [Member] Retail CA Redding [Member] Retail CA Redding [Member] Retail CA Merced [Member] Retail CA Merced [Member] Retail CA San Bernadino (1522 E. Highland Ave) [Member] Retail CA San Bernadino (1522 E. Highland Ave) [Member] Retail CA Corona [Member] Retail CA Corona [Member] Retail CA Vallejo [Member] Retail CA Vallejo [Member] Retail CA San Bernadino (648 W. 4th Street) [Member] Retail CA San Bernadino (648 W. 4th Street) [Member] Retail CA Mojave [Member] Retail CA Mojave [Member] Retail CA Barstow [Member] Retail CA Barstow [Member] Retail CA Colton (1904 Ranchero Ave) [Member] Retail CA Colton (1904 Ranchero Ave) [Member] Retail CA Moreno Valley [Member] Retail CA Moreno Valley [Member] Retail CA Fontana [Member] Retail CA Fontana [Member] Retail CA Rialto [Member] Retail CA Rialto [Member] Retail CA Desert Hot Springs [Member] Retail CA Desert Hot Springs [Member] Retail CA Beaumont [Member] Retail CA Beaumont [Member] Retail CA Colton (151 East Valley Blvd) [Member] Retail CA Colton (151 East Valley Blvd) [Member] Retail CA Yucaipa [Member] Retail CA Yucaipa [Member] Retail CA Riverside (9155 Jurupa Road) [Member] Retail CA Riverside (9155 Jurupa Road) [Member] Retail CA Riverside (5571 Mission Blvd) [Member] Retail CA Riverside (5571 Mission Blvd) [Member] Retail CA Total California [Member] Retail CA Total California [Member] Retail CT Waterbury [Member] Retail CT Waterbury [Member] Retail CT Newington [Member] Retail CT Newington [Member] Retail CT Total Connecticut [Member] Retail CT Total Connecticut [Member] Retail FL Tampa (Hyde Park) [Member] Retail FL Tampa (Hyde Park) [Member] Retail FL Tampa [Member] Retail FL Tampa [Member] Retail FL Total Florida [Member] Retail FL Total Florida [Member] Retail IL Lansing [Member] Retail IL Lansing [Member] Retail IA Dubuque [Member] Retail IA Dubuque [Member] Retail MD Rockville [Member] Retail MD Rockville [Member] Retail MD Baltimore (Towson) [Member] Retail MD Baltimore (Towson) [Member] Retail MD Annapolis [Member] Retail MD Annapolis [Member] Retail MD Wheaton [Member] Retail MD Wheaton [Member] Retail MD Glen Burnie [Member] Retail MD Glen Burnie [Member] Retail MD Total Maryland [Member] Retail MD Total Maryland [Member] Retail MA Dorchester [Member] Retail MA Dorchester [Member] Retail MA Springfield [Member] Retail MA Springfield [Member] Retail MA Chicopee [Member] Retail MA Chicopee [Member] Retail MA Cambridge [Member] Retailo MA Cambridge [Member] Retail MA Total Massachusetts [Member] Retail MA Total Massachusetts [Member] Retail MI Roseville [Member] Retail MI Roseville [Member] Retail MI Battle Creek [Member] Retail MI Battle Creek [Member] Retail MI Midland [Member] Retail MI Midland [Member] Retail MI Total Michigan [Member] Retail MI Total Michigan [Member] Retail NH Salem [Member] Retail NH Salem [Member] Retail NJ North Bergen (Tonnelle Ave) [Member] Retail NJ North Bergen (Tonnelle Ave) [Member] Retail NJ Union (Springfield Avenue) [Member] Retail NJ East Rutherford [Member] Retail NJ East Rutherford [Member] Retail NJ East Hanover I and II [Member] Retail NJ East Hanover I and II [Member] Retail NJ Garfield [Member] Retail NJ Garfield [Member] Retail NJ Lodi (Washington Street) [Member] Retail NJ Lodi (Washington Street) [Member] Retail NJ Englewood [Member] Retail NJ Englewood [Member] Retail NJ Bricktown [Member] Retail NJ Bricktown [Member] Retail NJ Totowa [Member] Retail NJ Totowa [Member] Retail NJ Hazlet [Member] Retail NJ Hazlet [Member] Retail NJ Carlstadt [Member] Retail NJ Carlstadt [Member] Retail NJ North Plainfield [Member] Retail NJ North Plainfield [Member] Retail NJ East Brunswick II (339-341 Route 18 S.) [Member] Retail NJ East Brunswick II (339-341 Route 18 S.) [Member] Retail NJ Manalapan [Member] Retail NJ Manalapan [Member] Retail NJ Marlton [Member] Retail NJ Marlton [Member] Retail NJ Union (Route 22 and Morris Ave) [Member] Retail NJ Union (Route 22 and Morris Ave) [Member] Retail NJ Hackensack [Member] Retail NJ Hackensack [Member] Retail NJ Watchung [Member] Retail NJ Watchung [Member] Retail NJ South Plainfield [Member] Retail NJ South Plainfield [Member] Retail NJ Eatontown [Member] Retail NJ Eatontown [Member] Retail NJ Cherry Hill [Member] Retail NJ Cherry Hill [Member] Retail NJ Dover [Member] Retail NJ Dover [Member] Retail NJ Lodi (Route 17 N.) [Member] Retail NJ Lodi (Route 17 N.) [Member] Retail NJ East Brunswick I (325-333 Route 18 S.) [Member] Retail NJ East Brunswick I (325-333 Route 18 S.) [Member] Retail NJ Jersey City [Member] Retail NJ Jersey City [Member] Retail NJ Morris Plains [Member] Retail NJ Morris Plains [Member] Retail NJ Middeltown [Member] Retail NJ Middeltown [Member] Retail NJ Woodbridge [Member] Retail NJ Woodbridge [Member] Retail NJ Delran [Member] Retail NJ Delran [Member] Retail NJ Lawnside [Member] Retail NJ Lawnside [Member] Retail NJ Kearny [Member] Retail NJ Kearny [Member] Retail NJ Bordentown [Member] Retail NJ Bordentown [Member] Retail NJ Turnersville [Member] Retail NJ Turnersville [Member] Retail NJ North Bergen (Kennedy Blvd) [Member] Retail NJ North Bergen (Kennedy Blvd) [Member] Retail NJ Montclair [Member] Retai NJ l Montclair [Member] Retail NJ Total New Jersey [Member] Retail NJ Total New Jersey [Member] Retail NY Valley Stream (Green Acres Mall) [Member] Retail NY Valley Stream (Green Acres Mall) [Member] Retail NY Bronx (Bruckner Blvd) [Member] Retail NY Bronx (Bruckner Blvd) [Member] Retail NY Hicksville (Broadway Mall) [Member] Retail NY Hicksville (Broadway Mall) [Member] Retail NY Poughkeepsie [Member] Retail NY Poughkeepsie [Member] Retail NY Huntington [Member] Retail NY Huntington [Member] Retail NY Mount Kisco [Member] Retail NY Mount Kisco [Member] Retail NY Bronx (Gun Hill Road) [Member] Retail NY Bronx (Gun Hill Road) [Member] Retail NY Staten Island [Member] Retail NY Staten Island [Member] Retail NY Inwood [Member] Retail NY Inwood [Member] Retail NY Queens (99-01 Queens Blvd) [Member] Retail NY Queens (99-01 Queens Blvd) [Member] Retail NY West Babylon [Member] Retail NY West Babylon [Member] Retail NY Freeport (437 E. Sunrise Highway) [Member] Retail NY Freeport (437 E. Sunrise Highway) [Member] Retail NY Dewitt [Member] Retail NY Dewitt [Member] Retail NY Buffalo (Amherst) [Member] Retail NY Buffalo (Amherst) [Member] Retail NY Oceanside [Member] Retail NY Oceanside [Member] Retail NY Albany (Menands) [Member] Retail NY Albany (Menands) [Member] Retail NY Rochester (Henrietta) [Member] Retail NY Rochester (Henrietta) [Member] Retail NY Rochester [Member] Retail NY Rochester [Member] Retail NY Freeport (240 Sunrise Highway) [Member] Retail NY Freeport (240 Sunrise Highway) [Member] Retail NY Commack [Member] Retail NY Commack [Member] Retail NY New Hyde Park [Member] Retail NY New Hyde Park [Member] Retail NY NY 1540 Broadway [Member] Retail NY NY 1540 Broadway [Member] Retail NY NY Manhattan Mall [Member] Retail NY NY Manhattan Mall [Member] Retail NY NY 828-850 Madison Avenue [Member] Retail NY NY 828-850 Madison Avenue [Member] Retail NY NY 4 Union Square South [Member] Retail NY NY 4 Union Square South [Member] Retail NY NY 478-482 Broadway [Member] Retail NY NY 478-482 Broadway [Member] Retail NY NY 40 East 66th Street [Member] Retail NY NY 40 East 66th Street [Member] Retail NY NY 25 W. 14th Street [Member] Retail NY NY 155 Spring Street [Member] Retail NY NY 155 Spring Street [Member] Retail NY NY 435 7th Avenue [Member] Retail NY NY 435 7th Avenue [Member] Retail NY NY 692 Broadway [Member] Retail NY NY 692 Broadway [Member] Retail NY NY 715 Lexington Avenue [Member] Retail NY NY 715 Lexington Avenue [Member] Retail NY NY 211-217 Columbus Avenue [Member] Retail NY NY 211-217 Columbus Avenue [Member] Retail NY NY 677-679 Madison Avenue [Member] Retail NY NY 677-679 Madison Avenue [Member] Retail NY NY 431 7th Avenue [Member] Retail NY NY 431 7th Avenue [Member] Retail NY NY 484-486 Broadway [Member] Retail NY NY 484-486 Broadway [Member] Retail NY NY 1135 Third Avenue [Member] Retail NY NY 1135 Third Avenue [Member] Retail NY NY 387 West Broadway [Member] Retail NY NY 387 West Broadway [Member] Retail NY NY 148 Spring Street [Member] Retail NY NY 148 Spring Street [Member] Retail NY NY 150 Spring Street [Member] Retail NY NY 150 Spring Street [Member] Retail NY NY 386 West Broadway [Member] Retail NY NY 386 West Broadway [Member] Retail NY NY 488 8th Avenue [Member] Retail NY NY 488 8th Avenue [Member] Retail NY NY 484 8th Avenue [Member] Retail NY NY 484 8th Avenue [Member] Retail NY NY 825 7th Avenue [Member] Retail NY NY 825 7th Avenue [Member] Retail NY Total New York [Member] Retail NY Total New York [Member] Retail PA Wilkes Barre [Member] Retail PA Wilkes Barre [Member] Retail PA Philadelphia [Member] Retail PA Philadelphia [Member] Retail PA Allentown [Member] Retail PA Allentown [Member] Retail PA Bensalem [Member] Retail PA Bensalem [Member] Retail PA Bethlehem [Member] Retail PA Bethlehem [Member] Retail PA Wyomissing [Member] Retail PA Wyomissing [Member] Retail PA York [Member] Retail PA York [Member] Retail PA Broomall [Member] Retail PA Broomall [Member] Retail PA Lancaster [Member] Retail PA Lancaster [Member] Retail PA Upper Mooreland [Member] Retail PA Upper Mooreland [Member] Retail PA Glenolden [Member] Retail PA Glenolden [Member] Retail PA Levittown [Member] Retail PA Levittown [Member] Retail PA Springfield [Member] Retail PA Springfield [Member] Retail PA Total Pennsylvania [Member] Retail PA Total Pennsylvania [Member] Retail SC Charleston [Member] Retail SC Charleston [Member] Retail TN Antioch [Member] Retail TN Antioch [Member] Retail TX Texarkana [Member] Retail TX Texarkana [Member] Retail UT Ogden [Member] Retail UT Ogden [Member] Retail VA Norfolk [Member] Retail VA Norfolk [Member] Retail VA Total Virginia [Member] Retail VA Total Virginia [Member] Retail WA Bellingham [Member] Retail WA Bellingham [Member] Retail DC 3040 M Street [Member] Retail DC 3040 M Street [Member] Retail WI Fond Du Lac [Member] Retail WI Fond Du Lac [Member] Retail PR Total Puerto Rico [Member] Retail PR Total Puerto Rico [Member] Retail Total Retail Properties [Member] Retail Total Retail Properties [Member] Merchandise Mart IL 350 North Orleans Chicago [Member] Merchandise Mart IL 350 North Orleans Chicago [Member] Merchandise Mart IL 527 W. Kinzie, Chicago [Member] Merchandise Mart IL 527 W. Kinzie, Chicago [Member] Merchandise Mart NY 7 West 34th Street [Member] Merchandise Mart NY 7 West 34th Street [Member] Merchandise Mart NY MMPI Piers [Member] Merchandise Mart NY MMPI Piers [Member] Merchandise Mart NY Total New York [Member] Merchandise Mart NY Total New York [Member] Merchandise Mart CA Gift and Furniture Mart, Los Angeles [Member] Merchandise Mart CA Gift and Furniture Mart, Los Angeles [Member] Merchandise Mart Other [Member] Merchandise Mart Other [Member] Merchandise Mart Total Merchandise Mart [Member] Merchandise Mart Total Merchandise Mart [Member] Warehouse/Industrial NJ East Hanover [Member] Warehouse/Industrial NJ East Hanover [Member] Warehouse/Industrial NJ Edison [Member] Warehouse/Industrial NJ Edison [Member] Warehouse/Industrial Total Warehouse/Industrial [Member] Warehouse/Industrial Total Warehouse/Industrial [Member] Other Properties Hotel Pennsylvania [Member] Other Properties Hotel Pennsylvania [Member] Other Properties 220 Central Park South [Member] Other Properties 220 Central Park South [Member] Other Properties Wasserman [Member] Other Properties Wasserman [Member] Other Properties 40 East 66th Residential [Member] Other Properties 40 East 66th Residential [Member] Other Properties 677-679 Madison [Member] Other Properties 677-679 Madison [Member] Other Properties Total Other Properties [Member] Other Properties Total Other Properties [Member] Leasehold Improvements Equipment and Other [Member] Leasehold Improvements Equipment and Other [Member] Total December 31, 2010 [Member] Total December 31, 2010 [Member] Description containing the consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes p rocedure if disclosures are provided in more than one note to the financial statements and description of all significant accounting policies of the reporting entity. Organization And Business [Text Block] Organization And Business The entire disclosure for the basis of presentation, or accounting, and significant accounting policies. Basis Of Presentation And Significant Accounting Policies [Text Block] Basis Of Presentation And Significant Accounting Policies Related Party Transactions Abstract Basis Of Presentation And Significant Accounting Policies Tables Abstract Non Cash Impairment And Other Losses [Table Text Block] Table summarizing non cash impairment and other losses on properties including related intangible assets Non Cash Impairment On Investments In Partially Owned Entities [Table Text Block] Table summarizing non cash impairment recognized on investments in partially owned entities Reconciliation Of Net Income Attributable To Common Shareholders To Estimated Taxable Income [Table Text Block] Table reconciling net income attributable to common shareholders to estimated taxable income Long Term Debt Maturities Future Repayments Of Principal [Table Text Block] Table of principal repayments of debt in the next five years Redeemable Noncontrolling Interest Table Text Block Operating Partnership Units Held By Third Parties Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. Schedule Of Share Based Compensation Stock Options Activity Table Text Block Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table Text Block Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table Text Block Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. Schedule Of Sharebased Compensation Restricted Operating Partnership Units Activity Table Text Block For restricted operating partnership units, disclosure of the number and weighted-average grant date fair value for restricted operating partnership units that were outstanding at the beginning and end of the year, and the number of restricted operating partnership units that were granted, vested, or forfeited during the year. Net Income Loss Attributable To Noncontrolling Interest Operating Partnerships And Preferred Unit Holders This elemenrt represents the sum of the amount of net income (loss) for the period allocated to noncontrolling partners in an operating partnership included in the entity's consolidated financial statements and the amount of net income (loss) for the period allocated to noncontrolling preferred unit holders in an entity included in the reporting entity's consolidated financial statements. Net (income) loss Attributable To Noncontrolling Interest In TheOperating Partnership Including Unit Distributions Leases [Text Block] Description and amounts of an entity's (as a lessor) leasing arrangements for operating, capital and leveraged leases and disclosure of entity's leasing arrangements (as a lessee) including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. This element can be used to disclose the entity's entire lease disclosure as a single block of text. Schedule Of Future Base Rental Future base rental revenue under non-cancelable operating leases, excluding rents for leases with an original term of less than one year and rents resulting from the exercise of renewal options Schedule Of Future Minimum Rental Payments For Operating Leases [Table Text Block] For operating leases having initial or remaining noncancelable lease terms in excess of one year, the lessee shall disclose both: future minimum payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years and the total minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented. Schedule Of Future Minimum Lease Payments For Capital Leases [Table Text Block] Disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. Schedule Of Quarterly Financial Information Table Text Block Disclosure of the quarterly financial data in the annual financial statements as a single block of text. The disclosure includes a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. Basis Of Presentation And Significant Accounting Policies Details Abstract Cost Of Real Estate Acquisitions Not Consummated [Member] Cost of real estate acquisitions not consummated Schedule Of Gain Loss On Investments [Table] Summarization of information required and determined to be disclosed concerning realized and unrealized gains and losses reported in the statement of income which have resulted from the sale or disposal and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. Gain Loss On Investments By Category [Axis] Information by category of marketable security. The categories of marketable securities are trading, available-for-sale, and held-to-maturity securities. Investment In Lexington Reality Trust [Member] Investment In Lexington Reality Trust [Member] Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net By Investment Category [Line Items] Significant Policies Other Details Abstract Payments Of Ordinary Dividends Percent Dividend percent paid to shareholders as ordinary income. Percent of dividend paid as ordinary income Payments Of Long Term Gain Loss Percent Dividend percent paid to shareholders as long term capital gain/ loss. Percent of dividend paid as Long term gain Payments Of Capital Distribution Percent Dividend percent paid to shareholders as return on capital. Percent of dividend paid as return on capital Payments Of Ordinary Dividends Net Percent Total dividend percent paid to shareholders. Percent of dividend paid to Shareholders Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Table] Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Axis] Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Domain] Depreciation And Amortization [Member] Depreciation And Amortization Member Straight Line Rent Adjustments [Member] Straight-line Rent Adjustments Member Earnings Of Partially Owned Entities [Member] Earnings Of Partially Owned Entities Member Reversal Of Deferred Tax Liability [Member] Reversal Of Deferred Tax Liability Derivatives [Member] Derivatives Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Line Items] Reconciliation of Net income to Estimated income tax payable Estimated Taxable Income Net Estimated taxable income after reconciliation for tax differences Real Estate Properties [Line Items] The amount of square footage related to a real estate property. Number Of Real Estate Properties The number of real estate properties owned as of the balance sheet date. Square Footage Of Real Estate Property The number of real estate properties owned as of the balance sheet date. Square Footage Of Real Estate Property Number Of Stores Represents the number of stores. Contolling Interest In Real Estate Properties Percent Percentage ownership in Real Estate Properties Schedule Of Real Estate Properties [Table] Schedule detailing quantitative information concerning real estate properties and units within those properties by ownership of the property Real Estate Properties [Axis] Information by ownership of the property. Real Estate Properties [Domain] Represents categories of ownership of real estate properties. Office Properties [Member] Office Properties Retail Properties [Member] Retail Properties Merchandise Mart Properties [Member] Merchandise Mart Properties Other Real Estate Investments [Member] Other Real Estate Investments New York City Metropolitan Area [Member] Domain member used to indicate facts reported for the New York Office Segment. Retail In Manhattan The Northeast States California And Puerto Rico [Member] Domain member used to indicate facts reported for the continuing operations in Manhattan The Northeast States California And Puerto Rico states Chicago [Member] Domain member used to indicate facts reported for the continuing operations in Chicago United States [Member] Domain member used to indicate facts reported for the continuing operations In United States. International [Member] Domain member used to indicate facts reported for the continuing operations Internationally. Future Stock Based Compensation Increase Decrease Increase decrease in futures share based compensation expense Amount authorized under a share based compensation plan Share Based Compensation Arrangement By Share Based Payment Award Amount Authorized Share Based Compensation Amount Authorized Initial Price Per Share For Total Return Calculation The initial share value for determination of the total return under the 2008 Out-Performance Plan Premium On Closing Price At Plan Adoption ForInitial Price Per Share Premium on the trailing 10-day average closing price on the New York Stock Exchange for get the initial price per share for determintation of the total return under the 2008 Out-Performance Plan Awards Entitlement As A Percentage Of Common Dividends Paid Percentage of common dividends paid entitled to be paid to the participants of the 2008 Out-Performance Plan during the plan performance period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grant Date Fair Value The fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Fair Value Of Awards Granted Share Based Compensation Arrangement By Share Based Payment Award Amortization Period The amortization period for amortizing the expense under the out performance plan. Award Amortization Period Share Based Compensation Arrangement By Share Based Payment Percent Awarded Percentage Of Share Based Compensation Units Awarded The percentage of units awarded under the plan. Dividends Share Based Compensation Dividends Paid On Nonvested Units Equity impact of aggregate cash, stock, and paid-in-kind dividends declared by an entity during the period and applicable to holders of share-based compensation, such as non-vested shares, stock options, or restricted stock units. This element includes paid and unpaid dividends declared during the period. Percent Of Market Price At Which Stock Options Are Granted The percent of the market price of a share of common stock at which the Company awards stock options to employees Share Based Compensation Arrangement By Share Based Payment Award Stock Options Expiration Term Stock Options Expiration Term The expiration term of stock options granted Share Based Compensation Employee Stock Purchase Plan Activity Abstract Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term 1 Options Outstanding Weighted Average Remaining Contractual Term The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value 1 Options Excercisable Aggregate Intrinsic Value The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. Share Based Compensation Equity Instruments Other Than Options Plan Activity Abstract Omnibus Share Plan 2010 [Member] Omnibus Share Plan 2010 Out Performance Plan 2008 [Member] Out Performance Plan 2008 Out Performance Plan 2006 [Member] Out Performance Plan 2006 Out Performance Plan 2008 And 2006 [Member] Out Performance Plan 2008 And 2006 Restricted Stock Units RSU [Member] Restricted Stock Units RSU Restricted Operating Partnership Units Plan [Member] Restricted Operating Partnership Units Plan Sharholders Equity Details [Abstract] Series I Preferred Stock [Member] Outstanding nonredeemable series I preferred stock or outstanding series I preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Preferred Stock Redemption Discount The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share. Series D10 Preferred Shares [Member] Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. Development Fee Percent Development fee as a percentage of the property development costs Development Fee Minimum Guaranteed Amount Development fee minimum guaranteed amount Leasing Services Fee Description Description of the fee for leasing services provided Commission On Asset Sales Description Description of commission on sales of assets under the leasing agreement Leasing Services Fee And Commission On Asset Sales Annual Installment Maximum Maximum annual installments payable on account of leasing services and commission on asset sales under the leasing agreement Other Services Fee Description Fee terms for supervision of cleaning, engineering and security services as per agreement Washington DC1140 Connecticut Avenue [Member] Domain member used to indicate facts reported for 1140 Connecticut Avenue. Washington DC1227 Twenty Fifth Street [Member] Domain member used to indicate facts reported for Washington DC 1227 Twenty Fifth Street. Washington DC1999K Street [Member] Domain member used to indicate facts reported for Washington DC 1999 K Street. High Point Complex [Member] Domain member used to indicate facts reported for High Point Complex. San Jose The Cannery[Member] Domain member used to indicate facts reported for San Jose The Cannery. Petangon Row [Member] Domain member used to indicate facts reported for Petangon Row. Columbus Avenue 211217 [Member] Domain member used to indicate facts reported for 211-217 Columbus Avenue. Americold [Member] Domain member used to indicate facts reported for other Americold. Tyson Dulles Plaza [Member] Domain member used to indicate facts reported for otherTyson Dulles Plaza office complex. Discontinued Operations Details [Abstract] Real Estate Property Sold Gross Sale of real estate property, gross Sale of real estate property, gross Real Estate Property Sold Net Net (non cash) proceeds from sales Net (non cash) proceeds from sales Collateral Property Net Carrying Value The net carrying value of property collateralizing the notes and mortgages payable Debt Repayment Of Principal [Line Items] Repayment Of Principal Debt Type [Table] Schedule of future principal repayments of debt by type Repayment Of Principal Debt Type [Axis] Schedule of future principal repayments of debt by type Repayment Of Principal Debt Type [Domain] Schedule of future principal repayments of debt by type Senior Unsecured Debt And Revolving Credit Facilities [Member] Schedule of future principal repayments of senior unsecured debt and revolving credit facilities payable Redeemable Noncontrolling Interest [Line Items] Redeemable Noncontrolling Interest Operating Partnership Units Outstanding Outstanding Partnership Units held by Third Parties Operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Redeemable Noncontrolling Interest Operating Partnership Units Liquidation Preference Per unit liquidation preference of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Per Unit Liquidation Preference Redeemable Noncontrolling Interest Operating Partnership Units Distribution Rate Preference or annual distribution rate of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Preference Or Annual Distribution Rate Redeemable Noncontrolling Interest Operating Partnership Units Redemption Price Per Share Redemption Price Per Unit Redemption price per unit of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Redeemable Noncontrolling Interest Operating Partnership Units Redemption Amount Redemption Amount Redemption amount of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Redeemable Noncontrolling Interest Operating Partnership Units Series Type [Table] Table containing details of operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Redeemable Noncontrolling Interest Operating Partnership Units Series Type [Axis] Information of the various Series types of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Redeemable Noncontrolling Interest Operating Partnership Units Series Type [Domain] Various Series types of the operating partnership units held by third parties that are included in the redeemable noncontrolling interests on the consolidated balance sheet. Series D10 Cumulative Redeemable Preferred Unit [Member] Series D10 7.00% Cumulative Redeemable Preferred Unit Series D11 Cumulative Redeemable Preferred Unit [Member] Series D11 7.20% Cumulative Redeemable Preferred Unit Series D12 Cumulative Redeemable Preferred Unit [Member] Series D12 6.55% Cumulative Redeemable Preferred Unit Series D14 Cumulative Redeemable Preferred Unit [Member] Series D14 6.75% Cumulative Redeemable Preferred Unit Series D15 Cumulative Redeemable Preferred Unit [Member] Series D15 6.875% Cumulative Redeemable Preferred Unit Series D16 Cumulative Redeemable Preferred Unit [Member] Series D16 5.00% Cumulative Redeemable Preferred Unit Derivative Instruments and Marketable Securities Tables Abstract Investments in Partially Owned Entities [Abstract] Investments In Partially Owned Entities Tables Abstract Mezzanine Loans Receivable [Abstract] Mezzanine Loans Receivable Tables Abstract Discontinued Operations [Abstract] Discontinued Operations Tables Abstract Identified Intangible Assets [Abstract] Identified Intangible Assets And Intangible Liabilities Tables Abstract Debt [Abstract] Debt Tables Abstract Redeemable Noncontrolling Interests [Abstract] Redeemable Noncontrolling Interests Tables Abstract Shareholders Equity Tables Abstract Fair Value Measurements [Abstract] Fair Value Measurements Tables Abstract Stock-based Compensation [Abstract] Stock Based Compensation Tables Abstract Fee and Other Income [Abstract] Fee And Other Income Tables Abstract Interest and Other Investment (Loss) Income, net [Abstract] Interest And Other Investment Loss Income Net Tables Abstract ScheduleOfInterest And Other Investment Income, Net [Text Block] Schedule Of Interest And Other Investment Income Net Text Block Income Per Share [Abstract] Income Per Share Tables Abstract Comprehensive Income [Abstract] Comprehensive Income Tables Abstract Leases Tables Abstract Quarterly Financial Data Tables Abstract Segment Information [Abstract] Segment Information Tables Abstract Organization and Business [Abstract] Organization And Business Details Abstract Leases Details Abstract Additional Rent Due Annually From Tenant Additional rent per annum due from Stop And Shop Capital Lease Terms Capital lease terms range Summary Of Quarterly Results Details Abstract Stock-based Compensation [Abstract] Stock Based Compensation Details Abstract Schedule Of Maturities Of Long Term Debt Table Text Block Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented Schedule Of Impaired Property Plant And Equipment [Table] Table summarizing non-cash impairment and other losses recognized Equity Method Investment Summarized Financial Information Table Text Block abular disclosure of the condensed financial statements of the euity method investees Balance Sheet Data: Income (Loss) from the Mark-to-Market of Derivative Positions in Marketable Equity Securities [Member] Income (Loss) from the Mark-to-Market of Derivative Positions in Marketable Equity Securities [Member] Marketable Equity Securities [Member] Marketable Equity Securities [Member] Wholly Owned Entities [Member] Wholly Owned Entities [Member] Partially Owned Entities [Member] Partially Owned Entities [Member] Discontinued Operations of Americold [Member] Discontinued Operations of Americold [Member] Non-financial Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block] Non-financial Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block] Additional Rent Due From Tenant Represents the Total Amount Due from Stop and Shop related to the guarantee Number Of Tenants Contributing Ten Percent Or More Of Total Revenues his element represents the number of tenants that contribute 10% or more to the total revenue of the company Retail San Jose Strip Centre [Member] Retail 510 5th Avenue [Member] PreferredStockDividendRateDollarPerShare This element represents the dollar value of annual dividend paid to the shareholders Construction Costs Budgeted Total construction cost budgeted for the project Annual Net Settled Payments Received This element represents the annual net settled payment received Annual Obligation to the County This element represents the total annual obligation to the County related to the development and management of the Cleveland Medical Mart and Convention Center Development and Operating Period Total number of years anticipated to develop and operate the Cleveland Medical Mart and Convention Center Commitments to Fund Improvments Additional commitments to fund tenant improvements Number of Stock Appreciation Rights Exercised Number of Stock Appreciation Rights exercised Proceeds From Exercise Of Stock Appreciation Rights he gross proceeds from the exercise of stock appreciation rights Interstate Properties [Member] nterstate Properties [Member] Percentage of Vornado Owned by Related Party his element represents the percentage of the company owned by related party Percentage of Alexanders Owned By Related Party Percentage of Alexanders Owned By Related Party Real Estate Acquired From Related Party [Axis] Real Estate Acquired From Related PArty Property [Domain] Property Domain Wayne Town Center [Member] ayne Town Center Member Impairment Losses On Marketable Securities [Member] Impairment losses on Marketable Equity Securities Member Conversion of Series F-1 preferred units Conversion of Series F-1 preferred units Conversion of Series F-1 preferred units Allocation of cash paid to the equity componenet upon repurchase of convertible senior debentures Allocation of cash paid to the equity component upon repurchase of convertible senior debentures Allocation of cash paid to the equity componenet upon repurchase of convertible senior debentures Limited partners' contributions: Interest received on repayment on mezzanine loan Interest received on repayment on mezzanine loan Interest received on repayment on mezzanine loan Reversal of H Street deferred tax liability The component of income tax expense for the period representing the change in the entity's deferred tax assets and liabilities pertaining to H Street. Reversal of H Street deferred tax liability Net gain on sale of Americold Realty Trust The net realized gain or loss on sale of Americold, which, for cash flow reporting, is a component of proceeds from investing activities. Acquisition and retirement of convertible senior debentures and senior unsecured notes The cash outflow from the repayment of debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder and the cash outflow from the repayment of senior unsecured notes. Redemption of redeemable noncontrolling interests The cash outflow during the period for redemption of redeemable noncontrolling interests. Redemption of redeemable noncontrolling interests Increase in assets and liabilities resulting from the consolidation of investment previously accounted for on the equity method (Beverly Connection in November 2008): Increase in assets and liabilities resulting from the consolidation of investment previously accounted for on the equity method: Real estate net Increase in Real estate, net resulting from the consolidation of investment previously accounted for on the equity method Real estate, net Restricted cash ease in Restricted cash resulting from the consolidation of investment previously accounted for on the equity method Other assets1 Increase in Other assets resulting from the consolidation of investment previously accounted for on the equity method Other assets Notes and mortgages payable Increase in Notes and mortgages payable resulting from the consolidation of investment previously accounted for on the equity method Accounts payable and accrued expenses Increase in Accounts payable and accrued expenses resulting from the consolidation of investment previously accounted for on the equity method Conversion Of Series Preferred Shares To Common Shares Shares Conversion Of Series A Preferred Shares To Common Shares, Shares Conversion Of Series Preferred Shares To Common Shares Shares Disposal Group Including Discontinued Operation Litigation Loss Accruals Impairments Valuation And Qualifying Accounts [Abstract] Schedule of Valuation and Qualifying Accounts [Abstract] Real Estate and Accumulated Depreciation [Abstract] Real Estate and Accumulated Depreciation Valuation And Qualifying Accounts Disclosure [Text Block] Valuation and Qualifying Accounts Disclosure Retail CA San Jose [Member] Retail CA San Jose Member Retail NJ Wayne Towne Center [Member] Retail NJ Wayne Towne Center [Member] Retail NY NY 510 5th Avenue [Member] Retail NY NY 510 5th Avenue [Member] Merchandise Mart IL Total [Member] Merchandise Mart IL Total [Member] Other Properties Atlantic City NJ [Member] Other Properties Atlantic City NJ [Member] Cleveland Medical Mart & Convention Center [Member] Cleveland Medical Mart & Convention Center Sale of real estate [Member] Sale of real estate [Member] Real Estate Investment Fund [Member] Real Estate Investment Fund [Member] Unpaid Balance Year End Interest Rate Interest rate at the period end as per the interest rate terms under the leasing agreement. Other Real Estate Revenue From Equity Method Investees Fee income for supervision of cleaning, engineering and security services as per agreement recognized during the period Property Management Fee Description A description of what the property management fee percentage is taken against to determine the fee charged to clients. Senior Notes 7375 Member Secured Term Loan Facility 700 Mllion Member Lexington Mortgage Notes Payable Member Lucida [Member] Lucida [Member] Debt Instruments Interest Rate At Period End Debt Instruments Interest Rate At Period End Warner Building [Member] Warner Building [Member] Straight Line Rent Adjustments This element represents the effect of straight lining of rental income due to contractual increases and amortization of free rent Four Investments Made By Fund nvestments made by the fund for four properties. Shops at Georgetown Park [Member] Shops at Georgetown Park [Member Third Avenue Manhattan Mezz Loan [Member] 757 Third Avenue Manhattan Mezz Loan [Member] Palisades Center New York [Member] Palisades Center New York [Member] Fifth Ave New York [Member] Fifth Ave New York [Member] Borgata Hotel and Casino [Member] Borgata Hotel and Casino [Member] Aquisitions Other [Axis] Aquisitions Other [Axis] Investrments Made In Other Aquisitions [Domain] Investrments Made In Other Aquisitions [Domain] Other Acquisitions Abstract San Jose Property [Member] San Jose Property [Member] Acres Of Land Measurement of land. Percentage Common Ownership Purchase Percentage Common Ownership Purchase Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Award Type [Axis] Axis for Full Value and Not Full Value Award types Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Award Type [Domain] Full Value Awards [Member] Not Full Value Awards [Member] Share Based Compensation Expense Additional Expense From Acceleration Of Vesting The total cost associated with acceleration of stock based compensation Additional Expense From Acceleration Of Vesting Restricted Operating Partnership And 2006 Out Performance Plan Combined [Member] Stock Options And 2008 Out Performance Plan Combined [Member] Real Estate, Net at Fair Value The component of Real Estate that has been measured at Fair Value Income Tax Liability Relating to Taxable REIT Subsidiaries Current This element represents the current income tax liability relating to the Taxable REIT Subsidiaries of the company Book To Tax Differences Mezzanine Loan Loss Accural Reversal This elememt represents the mezzanine loan loss accrual expense or reversal income Acquisitions Abstract Acquisitions TextBlock Decrease In Assets And Liabilities Resulting From Deconsolidation Of Investments That Were Previously Consolidated Real Estate, Net Deconsolidated Real Estate, Net Notes and Mortgages Payable Deconsolidated Notes and Mortgages Payable Net (gain) loss on early extinguishment of Debt excluding fees Net (gain) loss on early extinguishment of debt Real Estate, Period Increase, Total Recognition Of Deferred Revenue Adjusted For Discontinued Operations Amortization Of Below Market Leases Net Adjusted For Discontinued Operations Accounts receivable, net of allowance for doubtful accounts of $62,979 and $46,708 Accounts Receivable, Net, Total Fees owed by Alexander's under management agreements Accrued Fees and Other Revenue Receivable Identified intangible assets (included in other assets): Accumulated amortization Identified intangible assets (included in other assets): Accumulated amortization ccumulated amortization of identified intangible assets Finite-Lived Intangible Assets, Accumulated Amortization Accumulated other comprehensive income Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Less accumulated depreciation and amortization Less accumulated depreciation and amortization Less accumulated depreciation and amortization Less accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Real Estate Investment Property, Accumulated Depreciation Real Estate Investment Property, Accumulated Depreciation Additional capital Additional Paid In Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Total Distributions of income from partially owned entities Distributions of income from partially owned entities Gain Loss On Sale Of Property Net gain on sale of real estate Net gain on disposition of wholly owned and partially owned assets other than depreciable real estate Net gain on dispositions of assets other than depreciable real estate Net gain on dispositions of wholly owned and partially owned assets other than depreciable real estate Net gain on disposition of wholly owned and partially owned assets other than depreciable real estate Net gain on disposition of wholly owned and partially owned assets other than depreciable real estate Unrealized Gain Loss On Derivatives (Income) loss from the mark-to-market of derivative positions in marketable securities Income from mark-to-market of derivative position in marketable equity securities Allowance For Doubtful Accounts [Member] Allowance For Notes Receivable [Member] Amortization of deferred financing costs Increase in rental income Amortization of Intangible Assets Amortization of Intangible Assets, Total Due from officers Due from officers Stock Options [Member] Statement of Financial Position [Abstract] Assets Related To Discontinued Operations Assets Of Disposal Group Including Discontinued Operation Available For Sale Securities Gross Realized Gains Available For Sale Securities Gross Realized Gains Losses Sale Proceeds Net income per common share Net income per common share Net income (loss) per common share - Basic Amortization of Debt Discount (Premium) Buildings and improvements Buildings and Improvements, Gross, Total Business Acquisition Cost Of Acquired Entity Other Noncash Consideration Business Acquisition Cost Of Acquired Entity Purchase Price Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation Property Leased Under Capital Leases Accumulated Depreciation Capital Leases Future Minimum Payments Due Total Minimum Obligations Capital Leases Future Minimum Payments Due Abstract Capital Leases Future Minimum Payments Due Current 2011 Capital Leases Future Minimum Payments Due In Five Years 2015 Capital Leases Future Minimum Payments Due In Four Years 2014 Capital Leases Future Minimum Payments Due In Three Years 2013 Capital Leases Future Minimum Payments Due In Two Years 2012 Capital Leases Future Minimum Payments Due Thereafter Thereafter Capital Leases Future Minimum Payments Interest Included In Payments Interest Portion Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Present Value Of Net Minimum Payments Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash And Cash Equivalents [Policy Text Block] Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Capitalized interest Cash paid for capitalized interest Cash payments for interest (including capitalized interest of $875 and $14,054) Cash payments for interest (including capitalized interest of $875 and $14,054) Increase Decrease In Accounts Payable And Accrued Liabilities Accounts payable and accrued expenses Accounts payable and accrued expenses Accounts receivable, net Accounts receivable, net Straight-lining of rental income Straight-lining of rental income Prepaid assets Prepaid assets Commitments And Contingencies Disclosure Text Block Commitments and Contingencies Common shares of beneficial interest: authorized shares Common shares of beneficial interest: issued shares Common Stock, Shares, Issued, Total Common shares of beneficial interest: outstanding shares Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common shares of beneficial interest: $.04 par value per share; authorized, 250,000,000 shares; issued and outstanding 183,661,875 and 181,214,161 shares Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Comprehensive income attributable to Vornado Comprehensive income (loss) attributable to Vornado Comprehensive Income, Net of Tax, Attributable to Parent Comprehensive Income, Net of Tax, Attributable to Parent, Total Comprehensive Income Comprehensive Income (Loss) Convertible Preferred Stock Shares Issued Upon Conversion Convertible Preferred Stock Terms Of Conversion Convertible Preferred Stock [Member] Real Estate Cost Of Real Estate Sold Cumulative Preferred Stock [Member] Total debt Debt and Capital Lease Obligations Debt and Capital Lease Obligations, Total Debt Conversion, Original Debt, Amount Debt Carrying amount of debt component Long-term Debt, Gross Carrying amount of debt component Debt Instrument Decrease Repayments Debt Instrument, Face Amount Public Offering, Aggregate Principal Amount Debt Instrument, Face Amount Interest Rate, Effective Yield from Sale of Notes Debt Instrument, Interest Rate, Effective Percentage Interest Rate, End of Period Debt Instrument, Interest Rate at Period End Interest Rate, Stated Public Offering, Interest Rate Debt Instrument, Interest Rate, Stated Percentage Maturity Debt Instrument, Maturity Date Debt Instrument, Name [Domain] Unamortized discount Unamortized discount Debt Instrument, Unamortized Discount Debt Instrument [Axis] Debt issuance costs Debt issuance costs Deferred compensation plan assets (included in other assets) Deferred Compensation Plan Assets Deferred tax liabilities Deferred Income Tax Liabilities Receivable arising from the straight-lining of rents, net of allowance of $7,323 and $4,672 Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Total Derivative Average Forward Price Derivative Basis Spread On Variable Rate Derivative Name [Domain] Derivative Gain On Derivative Derivative Inception Date Derivative Maturity Date Derivative Number Of Instruments Held Derivative Price Risk Option Strike Price Derivative Assets Derivative By Nature [Axis] Derivative [Line Items] Derivative [Table] Derivatives Methods Of Accounting Hedging Derivatives [Policy Text Block] Real Estate Held For Development And Sale [Policy Text Block] Development costs and construction in progress Earnings Per Share Diluted Net income per common share Net income per common share Net income (loss) per common share - Diluted Discontinued Operations Investments in Partially Owned Entities Disposal Groups Including Discontinued Operations Name [Domain] Total revenues Disposal Group, Including Discontinued Operation, Revenue Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Axis] Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Net gains on sale of real estate Gain (Loss) from Disposal of real estate Disposal Group Not Discontinued Operation Income Statement Disclosures Abstract Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income (loss) from partially owned entities Income Loss From Equity Method Investments Equity in income of partially owned entities including ToysRUs Income (Loss) from Equity Method Investments, Total Share Based Compensation Expense Equity Method Investments Excess of investee's carrying amount over equity in net assets Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Total Equity Method Investee Name [Domain] Equity Method Investment Market Value Equity Method Investment, Quoted Market Value Equity method ownership percentage Ownership percentage of Toys Equity method ownership percentage Extinguishment of a liability in connection with the acquisition of real estate Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets [Line Items] Schedule Of Finite Lived Intangible Assets By Major Class [Table] Mortgages Payable [Member] Forward Contracts [Member] Future Amortization Expense, Year Five Future Amortization Expense, Year Four Future Amortization Expense, Year One Future Amortization Expense, Year Three Future Amortization Expense, Year Two Gain Loss Related To Litigation Settlement Net (loss) gain on early extinguishment of debt Net loss (gain) on early extinguishment of debt Net gain on early extinguishment of debt Gains (Losses) on Extinguishment of Debt, Total General and administrative General and administrative General and Administrative Expense, Total General Liability [Member] Identified Intangibles [Policy Text Block] Impairment Of Investments net Real Estate Improvements INCOME PER COMMON SHARE - BASIC: INCOME (LOSS) PER COMMON SHARE - BASIC: Income Statement [Abstract] Income (loss) from continuing operations, net of income attributable to noncontrolling interests Income (Loss) from Continuing Operations Attributable to Parent Income (Loss) from Continuing Operations Attributable to Parent, Total Income Loss From Continuing Operations Per Diluted Share Income from continuing operations, net Income (loss) from continuing operations, net - Diluted Income (loss) from continuing operations, net Income from continuing operations, net Income (Loss) from Continuing Operations, Per Outstanding Share, Total Income Loss From Discontinued Operations Net Of Tax Income from discontinued operations Income from discontinued operations (Loss) income from discontinued operations Income from discontinued operations, including portion attributable to noncontrolling interests Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total (Loss) income from discontinued operations, net Income from discontinued operations, net Income from discontinued operations, net Income from discontinued operations, net - Diluted Income Loss From Discontinued Operations Net Of Tax Per Basic Share (Loss) income from discontinued operations, net Income from discontinued operations, net Income from discontinued operations, net - Basic Net (income) loss attributable to noncontrolling interests in consolidated subsidiaries Net (income) loss attributable to noncontrolling interests in consolidated subsidiaries Net (income) loss attributable to noncontrolling interests in consolidated subsidiaries Limited Partners Contributions Other Other Income Tax [Policy Text Block] Deposits in connection with real estate acquisitions Deposits in connection with real estate acquisitions Other assets Other assets Increase Decrease In Restricted Cash Restricted cash Increase (Decrease) in Restricted Cash, Total Identified Intangibles Identified intangible assets (included in other assets): Gross Identified intangible assets (included in other assets): Gross Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross, Total Identified intangible assets (included in other assets): Net Identified intangible assets (included in other assets): Net Identified intangible assets, net of accumulated amortization of $338,508 and $311,118 Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net, Total Inventory Real Estate Held For Sale Condominium Assets held for sale Investment Advisory Fees Partially Owned Entities [Policy Text Block] Marketable Securities [Policy Text Block] Carrying amount of investments in partially owned entitiies Carrying amount of investments in partially owned entities Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total Investments in partially owned entities Schedule of Derivative Instruments and Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Common limited partnership interest in the Operating Partnership Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Land Land Land [Member] Total liabilities Liabilities Total liabilities, redeemable noncontrolling interests and equity Total liabilities, redeemable noncontrolling interests and equity Liabilities and Stockholders' Equity LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities related to discontinued operations Line of Credit Facility, Maximum Borrowing Capacity Revolving credit facility debt Long-term Line of Credit, Total Mezzanine Loans Receivable [Policy Text Block] Thereafter 2011 2015 2014 2013 2012 Loss Contingencies by Nature of Contingency [Axis] Loss Contingency, Nature [Domain] Marketable securities Marketable Securities, Total Derivative Instruments and Marketable Securities [Abstract] Noncontrolling interest in consolidated subsidiaries Noncontrolling interests in consolidated subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Related Party Transactions By Related Party [Axis] Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash Flows from Financing Activities: Net cash provided by (used in) investing activities Net cash provided by (used in) investing activities Cash Flows from Investing Activities: Net cash provided by operating activities Net cash provided by operating activities Cash Flows from Operating Activities: Net income attributable to Vornado Income (loss) from continuing operations, net of income attributable to noncontrolling interests Net income attributable to Vornado Net income (loss) attributable to Common Shareholders NET INCOME attributable to common shareholders Net income (loss) attributable to common shareholders NET INCOME attributable to common shareholders Income (loss) from continuing operations, net of income attributable to noncontrolling interests Net (decrease) increase in cash and cash equivalents Net increase in cash and cash equivalents Recently Issued Accounting Literature Interest and debt expense (including amortization of deferred financing costs of $5,200 and $4,350 in each three-month period, respectively, and $14,169 and $12,722 in each nine-month period, respectively) Interest and debt expense (including amortization of deferred financing costs of $18,511, $17,593 and $17,409 respectively Interest and debt expense Interest and Debt Expense, Total Notes and mortgages payable Notes And Loans Payable Notes and Loans Payable, Total Mezzanine loans receivable, net of allowance of $73,216 and $190,738 Mezzanine loans receivable Notes receivable, net Notes, Loans and Financing Receivable, Net, Total Notional Amount Of Price Risk Derivatives Operating Leases Future Minimum Payments Due Abstract Operating Leases Future Minimum Payments Receivable Abstract Operating Leases Future Minimum Payments Due Current 2011 Operating Leases Future Minimum Payments Receivable Current 2011 Operating Leases Future Minimum Payments Due In Five Years 2015 Operating Leases Future Minimum Payments Due In Four Years 2014 Operating Leases Future Minimum Payments Due In Three Years 2013 Operating Leases Future Minimum Payments Due In Two Years 2012 Operating Leases Future Minimum Payments Due Thereafter Thereafter Operating Leases Future Minimum Payments Receivable In Five Years 2015 Operating Leases Future Minimum Payments Receivable In Four Years 2014 Operating Leases Future Minimum Payments Receivable In Three Years 2013 Operating Leases Future Minimum Payments Receivable In Two Years 2012 Operating Leases Future Minimum Payments Receivable Thereafter Thereafter Property rentals Total rentals Operating Leases, Income Statement, Lease Revenue, Total Operating Leases Rent Expense Minimum Rentals Rent Expense Operating income Operating income Operating income (loss) Real Estate Other Acquisitions Real Estate Accumulated Depreciation Other Additions Other assets, Other assets Other assets Change in pension plans Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax, Total Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Change in unrealized net gain or (loss) on securities available-for-sale Change in unrealized net gain or loss on securities available-for-sale Change in unrealized net gain or (loss) on sale of securities available for sale Other Comprehensive Income Unrealized Gain Loss, Total Other liabilities Other liabilities Other income Other Other Real Estate Revenue Short-term investments Proceeds From Partnership Contribution Dividends paid on common shares Dividends paid on common shares Distributions to noncontrolling interests Distributions to noncontrolling interests Payments Of Dividends Preferred Stock And Preference Stock Dividends paid on preferred shares Dividends paid on preferred shares Retirement Plan Merchandise Mart Properties Pension Plan settlement expense Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period Preferred Stock Dividend Rate Percentage Or Per Dollar Amount Preferred shares of beneficial interest: authorized shares Preferred shares of beneficial interest: issued shares Preferred Stock, Shares Issued, Total Preferred shares of beneficial interest: outstanding shares Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred share dividends Preferred Stock Dividends Preferred Stock Par Or Stated Value Per Share Redeemable noncontrolling interests units outstanding Redeemable noncontrolling interests units outstanding, Class A units Accounts receivable, allowance for doubtful accounts Proceeds from Sale and Maturity of Held-to-maturity Securities Proceeds from Sale and Maturity of Held-to-maturity Securities, Total Proceeds from issuance of common shares Proceeds From Minority Shareholders Contributions from noncontrolling interests Proceeds from borrowings Proceeds from borrowings Proceeds from borrowings Proceeds from sales of, and return of investment in, marketable securities Proceeds from sales of and return of investment in, marketable securities Proceeds from repayment of mezzanine loans receivable Cash Sale of Real Estate Proceeds received from exercise of employee share options Real Estate Accumulated Depreciation Depreciation Expense Provision for Loan and Lease Losses Provision for Loan and Lease Losses, Total Development costs and construction in progress Payments For Construction In Process Investments in partially owned entities Payments To Acquire Equity Method Investments Payments to Acquire Investments Payments to Acquire Investments, Total Purchases of marketable securities Purchases of marketable securities Purchases of marketable securities Payments to Acquire Marketable Securities Investments in notes and mortgage loans receivable Investments in mezzanine loans receivable and other Acquisitions of real estate and other Acquisitions of real estate and other Purchases of short-term investments Purchases of short-term investments Schedule Of Real Estate And Accumulated Depreciation Text Block Real Estate And Accumulated Depreciation Disclosure Text Block Real Estate And Accumulated Depreciation Accumulated Depreciation Real Estate And Accumulated Depreciation Amount Of Encumbrances Real Estate And Accumulated Depreciation Date Acquired Real Estate And Accumulated Depreciation Date Of Construction Real Estate And Accumulated Depreciation Name Of Property [Domain] Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements Real Estate And Accumulated Depreciation Carrying Amount Of Land Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements Real Estate And Accumulated Depreciation Initial Cost Of Land Real Estate And Accumulated Depreciation Life Used For Depreciation Real Estate And Accumulated Depreciation Description Of Property [Axis] Real Estate And Accumulated Depreciation [Line Items] Real Estate And Accumulated Depreciation By Property [Table] Real estate at cost Total Real estate at cost Real estate at Cost Real estate at Cost Real estate, at cost: Real estate, at cost: Real estate, net Real estate, net Total Revenues Total Revenues Revenues REVENUES: Allowance For Doubtful Accounts [Policy Text Block] Reconciliation Of Real Estate Accumulated Depreciation Roll Forward Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward Redeemable Preferred Stock [Member] Related Party [Domain] Related Party Transaction Amounts Of Transaction Related Party Transaction Description Of Transaction Related Party Transaction [Line Items] Related Party Transactions Disclosure Text Block Schedule Of Related Party Transactions By Related Party [Table] Repayments of borrowings Repayments of borrowings Repayments of borrowings Repayments Of Unsecured Debt Reporting Segment [Domain] Retained Earnings Accumulated Deficit Earnings less than distributions Earnings less than distributions Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Revenue Recognition [Policy Text Block] Tenant expense reimbursements Equity Method Investments Latest available financial information on investee, table Equity Method Investments [Text Block] Schedule of Identified Intangible Assets and Intangible Liabilities (Table) Schedule of Finite-Lived Intangible Assets by Major Class [Text Block] Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans Schedule of Debt Schedule of Long-term Debt Instruments [Text Block] Schedule Of Assets And Liabilities And Results Of Operations Related To Discontinued Operations Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Text Block] Schedule Of Preferred Units Text Block Subsequent Event Schedule of Subsequent Events [Text Block] Schedule Of Valuation And Qualifying Accounts Disclosure Text Block Segment Information Segment Reporting Disclosure [Text Block] Segment Information Schedule of Segment Information Segment Reporting Information by Segment [Axis] Schedule of Segment Reporting Information by Segment [Table] Series D Preferred Stock [Member] Series E Preferred Stock [Member] Series F Preferred Stock [Member] Series G Preferred Stock [Member] Series H Preferred Stock [Member] Series A Preferred Stock [Member] Forfeited Units Units Cancelled Weighted Average Grant Date Fair Value Restricted Stock Granted Shares Fair Value Of Awards Granted Units Granted Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, End of Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period Compensation Cost Not Yet Recognized Compensation Cost Not Yet Recognized Compensation Cost Recognition Period Compensation Cost Recognition Period Units Vested Fair Value Of Awards Vested Awards Vested Weighted Average Grant Date Fair Value Award Vesting Period Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Share Based Compensation Shares Available For GrantShare Based Compensation Shares Available For Grant Share Based Compensation Shares Available For Grant Total Intrinsic Value Of Options Excercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Stock Options Exercised Weighted Average Exercise Price Stock Options Cancelled Weighted Average Exercise Price Stock Options Granted Shares Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Stock Options Granted Weighted Average Exercise Price Grant Date Fair Value Of Options Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period Options Excercisable Shares Options Excercisable Weighted Average Exercise Price Options Exercisable Weighted Average Remaining Contractual Term Fair Value Assumptions Risk Expected Dividend Yield Fair Value Assumptions Expected Life Fair Value Assumptions Expected Volatility Rate Fair Value Assumptions Risk Free Interest Rate Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Award Type And Plan Name [Axis] Cash Received From Exercise Of Stock Options Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Share Based Compensation Option And Incentive Plans [Policy Text Block] Vornado shareholders' equity: Stockholders Equity Note Disclosure Text Block Shareholders' Equity Subsequent Event Type [Axis] Subsequent Events [Line Items] Subsequent Event [Table] Subsequent Event Type [Domain] Summary Of Derivative Instruments Abstract Identified Intangible Assets Identified Intangible Assets and Intangible Liabilities Supplementary Insurance Information, Segment Name [Axis] Supplementary Insurance Information, Segment Name [Domain] Cash payments for income taxes Cash payments for income taxes Equity Equity Method Investment, Summarized Financial Information, Equity or Capital Liabilities Equity Method Investment, Summarized Financial Information, Liabilities Equity Method Investment, Summarized Financial Information, Liabilities, Total Noncontrolling interests Equity Method Investment, Summarized Financial Information, Noncontrolling Interest Net (loss) income attributable to investee Equity Method Investment, Summarized Financial Information, Net Income (Loss) Total revenue Equity Method Investment, Summarized Financial Information, Net Sales or Gross Revenue Assets Equity Method Investment, Summarized Financial Information, Assets Equity Method Investment, Summarized Financial Information, Assets, Total Unrealized Gain Loss On Securities Senior unsecured notes Unsecured Debt, Total Valuation Allowances And Reserves Balance Balance at Beginning of Year Balance at End of Year Valuation Allowances And Reserves Charged To Cost And Expense Additions Charged Against Operations Valuation Allowances And Reserves Deductions Uncollectable Accounts Written-Off Valuation Allowances And Reserves [Domain] Valuation And Qualifying Accounts Disclosure [Line Items] Valuation Allowances And Reserves Type [Axis] Valuation And Qualifying Accounts Disclosure [Table] Weighted average shares Denominator for diluted income (loss) per share - weighted average shares and assumed conversions Denominator for diluted income per share - adjusted weighted average shares and assumed conversions Weighted Average Number of Shares Outstanding, Diluted, Total Weighted average number shares Weighted average shares Denominator for basic income (loss) per share - weighted average shares Weighted Average Number of Shares Outstanding, Basic, Total Board Of Directors Chairman [Member] Chief Executive Officer [Member] Immediate Family Member Of Management Or Principal Owner Member Common Shares Other Capitalized Property Plant And Equipment [Member] Property Plant And Equipment Type [Domain] Property Plant And Equipment Useful Life Maximum Property Plant And Equipment Useful Life Minimum Assets Held For Sale [Member] Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract Preferred Shares Aggregate unrealized gains Available-for-sale Securities, Gross Unrealized Gains Debt securities(1) Available-for-sale Securities, Debt Securities Marketable equity securities - available for sale Marketable equity securities Available-for-sale Securities, Equity Securities Unrealized gain in connection with the reclass from held to maturity to available for sale Held-to-maturity Securities, Transferred Security, at Carrying Value Gain from the sale of Held-to-maturity Security Held-to-maturity Securities, Sold Security, Realized Gain (Loss) Total assets Total assets Assets Mezzanine Loans Receivable - Carrying Amount Notes, Loans and Financing Receivable, Gross Valuation allowance Valuation allowance Mezzanine loans receivable, allowance Unrealized gain in connection with the reclass from Held-to-maturity to available for sale Held-to-maturity Securities, Transferred to Available-for-sale Securities, Unrealized Gain (Loss) Investment Income Text Block Investment Income Text Block Interest and Other Investment Income (Loss), Net Investment Income, Categories [Domain] Interest and other investment (loss) income, net Interest and other investment income (loss), net Interest and other investment (loss) income, net Total Interest and Other Investment Income, net Preferred Stock Redemption Price Per Share DIVIDENDS PER COMMON SHARE DIVIDENDS PER COMMON SHARE Closing share price Subsidiary or Equity Method Investee, Price-Per-Share Stock-based Compensation Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value Disclosure Item Amounts Domain Carrying (Reported) Amount, Fair Value Disclosure [Member] Portion at Fair Value, Fair Value Disclosure [Member] [Default] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Scenario, Unspecified [Domain] Scenario, Actual [Member] Statement [Table] Statement, Scenario [Axis] Real Estate Accumulated Depreciation Period Increase Decrease Sales Of Real Estate Assets Abstract ASSETS Statement [Line Items] INCOME PER COMMON SHARE - DILUTED: INCOME (LOSS) PER COMMON SHARE - DILUTED: Fair Value, Measurement Inputs, Disclosure Schedule of Fair Values of Financial Assets and Liabilities by Levels Table Fair Value, Measurement Inputs, Disclosure [Text Block] Real Estate [Policy Text Block] Fair Value Assets Measured On Recurring Basis [Table] Fair Value, Assets Measured on Recurring Basis, Disclosure Items [Axis] Fair Value, Assets Measured on Recurring Basis, Disclosure Items [Domain] Fair value of Series G convertible preferred units and Series D-13 cumulative redeemable preferred units Fair Value, Liabilities Measured on Recurring Basis, Mandatorily Redeemable Preferred Stock Summary of Changes in Level 3 Deferred Compensation Plan Assets Table Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Text Block] Ending Balance Beginning Balance Balance - changes in Level 3 " deferred compensation plan assets" Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements Assets Purchases, Sales,Other Settlements and issuances, net Total realized/unrealized gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Purchases, sales, other settlements and issuances, net Purchases, sales, other settlements and issuances, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, Sales, Issuances, Settlements Fair Value, Inputs, Level 1 [Member] Fair Value Inputs Level 2 Member Fair Value, Inputs, Level 3 [Member] Fair Value Assets Measured On Nonrecurring Basis [Table] Fair Value Assets Measured On Nonrecurring Basis Disclosure Items [Axis] Fair Value Assets Measured On Nonrecurring Basis Disclosure Items Domain Fair Value Assets Measured On Nonrecurring Basis Financial Statement Captions [Line Items] Investments In Affiliates Subsidiaries Associates And Joint Ventures Fair Value Disclosure Investments in Partially Owned Entities at Fair Value Shareholders' Equity [Abstract] Shareholders' Equity [Abstract] Fair Value Measurements Capital Leased Assets Gross Property Leased Under Capital Leases Cost Quarterly Financial Information Text Block Preferred Stock Liquidation Preference Quarterly Financial Data Abstract Class of Stock [Domain] Common Class A [Member] Property Plant And Equipment Net By Type Abstract Real Estate Accumulated Depreciation Real Estate Sold Convertible senior debentures Convertible senior debentures Convertible Debt, Total EXPENSES: Operating Operating expenses Operating Expenses, Total Weighted average common share equivalents of excluded dilutive securities due to anti-dilutive effect Weighted average common share equivalents of excluded dilutive securities due to anti-dilutive effect. Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Per Share [Policy Text Block] Non-cash purchase price accounting adjustments Non-cash purchase price accounting adjustments Goodwill, Translation and Purchase Accounting Adjustments Increase Decrease In Other Operating Liabilities Other liabilities Other liabilities Amortization of below-market leases, net Amortization of below-market leases, net Amortization of acquired below-market leases, net Discount on preferred share redemptions Preferred Stock Redemption Premium Schedule of Investment Income, Reported Amounts, by Category [Axis] Schedule Of Equity Method Investments [Table] Schedule of Equity Method Investment Equity Method Investee Name [Axis] Schedule Of Equity Method Investments [Line Items] Parent Company [Member] Class of Stock [Axis] Deferred credit Deferred Revenue And Credits Deferred Revenue and Credits, Total Long Term Debt Abstract Common shares of beneficial interest: par value per share Sale of securities available-for-sale Sale of securities available-for-sale Deferred Charges [Policy Text Block] Property Plant And Equipment By Type [Axis] Property Plant And Equipment [Line Items] Total expenses Total expenses Total expenses Total Vornado shareholders' equity Total Vornado shareholders' equity Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Income tax expense Income tax (expense) benefit Income tax (expense) benefit Income tax (expense) benefit Income tax (expense) benefit Income tax (expense) benefit Interest Costs Capitalized Preferred shares of beneficial interest: no par value per share; authorized 110,000,000 shares; issued and outstanding 32,340,009 and 33,952,324 shares Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Adjustments to redeemable Class A Operating Partnership units Adjustments to carry Class A redeemable Units at redemption value Adjustments to redeemable Class A Operating Partnership units Adjustment to carry redeemable Class A units at redemption value Percentage Rent Marketable equity securities Marketable equity securities Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Categories Of Investments [Domain] Statement, Equity Components [Axis] Additional Capital Earnings Less Than Distributions Accumulated Other Comprehensive Income (Loss) Equity Component [Domain] Employee Stock Option [Member] Disposal Group Including Discontinued Operation Additional Disclosures Abstract Stock Options Cancelled Shares Proceeds from the issuance of common shares, value Deferred compensation shares and options, value Under employees' share option plan, value Voluntary surrender of equity awards on March 31, 2009 Voluntary surrender of equity awards on March 31, 2009 Voluntary surrender of equity awards on March 31, 2009 Stock Issued During Period Value Stock Dividend Dividends paid in common shares In connection with dividend reinvestment plan, Value Proceeds from the issuance of common shares, shares Stock Issued During Period, Shares, New Issues Deferred compensation shares and options, shares Common shares issued: Stock Options Exercised Shares Dividends paid on common shares, shares In connection with dividend reinvestment plan, Shares Convertible preferred shares - Denominator Incremental Common Shares Attributable to Conversion of Preferred Stock Under employees' share option plan, shares Redemption of Class A Operating Partnership units for common shares at redemption value Conversion of Class A redeemable units into common shares, at redemption value Conversion of Class A redeemable units into common shares, at redemption value Upon redemption of Class A units, at redemption value, value Upon redemption of Class A units, at redemption value, shares Stock Redeemed Or Called During Period Value Redemption of preferred shares, value Redemption of preferred shares, value Convertible preferred share dividends - Numerator Convertible Preferred Dividends, Net of Tax Gain Loss On Contract Termination Leasehold improvements and equipment Leasehold improvements and equipment Additions to real estate Additions to real estate Options Vested And Expected To Vest Weighted Average Exercise Price Options Vested And Expected To Vest Aggregate Intrinsic Value Options Outstanding Aggregate Intrinsic Value Options Vested And Expected To Vest Weighted Average Remaining Contractual Term Options Vested And Expected To Vest Shares Stock Redeemed Or Called During Period Shares Redemption of preferred shares, shares Dividends Common Stock Dividends paid on common shares, value Dividends paid on common shares Dividends paid on common shares, value Dividends, Common Stock, Total Dividends paid on preferred shares Dividends paid on preferred shares, value Dividends paid on preferred shares, value Preferred share dividends Dividends, Preferred Stock, Total Income Per Share Net income Net income (loss) Net income Net income (loss) Net income attributable to noncontrolling interests, including unit distributions Net (income) attributable to noncontrolling interests in the Operating Partnership, including unit distributions Net income attributable to noncontrolling interests, including unit distributions Net (income) loss attributable to noncontrolling interests, including unit distributions Net income attributable to noncontrolling interests, including unit distributions Business Acquisition Cost Of Acquired Entity Cash Paid Business Acquisition Cost Of Acquired Entity Liabilities Incurred Property rentals Minimum Rents Income from continuing operations (Loss) income from continuing operations Income from continuing operations Income loss from continuing operations Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity Income from discontinued operations, net of income attributable to noncontrolling interests Depreciation and amortization (including amortization of deferred financing costs) Depreciation, Depletion and Amortization, Total Legal Entity Type of Counterparty [Domain] Accounts, Notes, Loans and Financing Receivable by Legal Entity of Counterparty, Type [Axis] Comprehensive income Comprehensive income (loss) Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total Less: Comprehensive income (loss) attributable to noncontrolling interests Less: Comprehensive income attributable to noncontrolling interests Comprehensive Income, Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income, Net of Tax, Attributable to Noncontrolling Interest, Total Total equity Ending balance, value Beginning balance, value Total equity Non-controlling Interests Parent [Member] Unrealized net gain (loss) on securities available for sale Change in unrealized net gain or loss on securities available-for-sale Unrealized net gain (loss) on securities available for sale Change in unrealized net gain or loss on securities available-for-sale Unrealized net gain (loss) on sale of securities available for sale Available-for-sale Securities, Gross Unrealized Losses, Total Class Of Stock [Line Items] Schedule Of Stock By Class [Table] Leases Abstract Commitments and contingencies Derivative Instrument and Marketable Securities Text Block Derivative Instrument and Marketable Securities Restricted cash Restricted Cash And Cash Equivalents Proceeds from sales of real estate and related investments Proceeds from sales of real estate and related investments Adjustments to reconcile net income to net cash provided by operating activities: Changes in operating assets and liabilities: Other non-cash adjustments Other non-cash adjustments Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Total Other non-cash adjustments Long-term Debt, Type [Axis] Accounts Payable And Accrued Liabilities Current And Non Current Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Long-term Debt, Type [Domain] Real Estate [Member] Deferred compensation plan Deferred Compensation Liability, Current and Noncurrent, Total Other Other Other Interest Rate, Range, Minimum Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum Interest Rate, Range, Maximum Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum Other Investment Companies [Member] Investment Owned At Fair Value Explanation Differences Between Book And Tax Basis Investment Owned Balance Shares Cost associated with purchasing the investments Investment Owned, at Cost Maturity, Range, Start Debt Instrument, Maturity Date Range, Start Maturity, Range, End Debt Instrument, Maturity Date Range, End Equity Contract [Member] Derivative Contract Type [Domain] Carrying amount of equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Amendment Flag Current Fiscal Year End Date Document Period End Date Entity [Domain] Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type