Square footage of real estate property (in sqft) Area of Real Estate Property Additions to real estate Payments to Acquire Real Estate Real Estate Fund Investments [Abstract] Real Estate Fund Investments [Abstract] Document Type Document Type Other, net Other Nonoperating Income (Expense) Upon redemption of Class A units, at redemption value, shares Stock Issued During Period, Shares, Conversion of Units Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Interest expense Interest Costs Incurred Series A Preferred Stock Series A Preferred Stock [Member] Related Party [Axis] Related Party [Axis] Interest and debt expense Interest and debt expense, Total Interest and debt expense Interest and Debt Expense Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Under dividend reinvestment plan, shares Stock Issued During Period, Shares, Dividend Reinvestment Plan Segments [Axis] Segments [Axis] Net unrealized loss on real estate fund investments Net Unrealized Gain (Loss) On Real Estate Fund Investments This element represents the realized and unrealized gains included in the earnings resulting from assets that are measured at fair value, that relate to the real estate funds assets. Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other real estate owned, measurement input Other Real Estate Owned, Measurement Input Level 3 Fair Value, Inputs, Level 3 [Member] Percent vested, year four Share Based Compensation, Percent Vested, Year Four Share Based Compensation, Percent Vested, Year Four Interest accrual Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Interest Accrual Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Interest Accrual Proceeds from sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Gross amount Finite Lived Intangible Liability Gross 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. Amount of basis points by which vornado underperforms the index, total Amount of Basis Points by Which Vornado Underperforms the Index Amount of Basis Points by Which Vornado Underperforms the Index Moynihan Train Hall expenditures Payments for Construction in Process Mortgages payable, net Loans Payable Realized and unrealized gains (losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Realized And Unrealized Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Realized And Unrealized Statistical Measurement [Domain] Statistical Measurement [Domain] LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities and Equity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Schedule Of Income And Loss From The Fund Schedule Of Income And Loss From The Fund [Table Text Block] The schedule that provides the details of Income and Loss from the Real Estate Fund Distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Preferred Shares Preferred Stock [Member] Security Exchange Name Security Exchange Name Deferred leasing costs, net of accumulated amortization of $198,723 and $196,972 Deferred Leasing And Financing Costs Net Of Accumulated Amortization 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 amortization) 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. Alexanders Inc Alexanders Inc [Member] Alexanders Inc Proceeds from borrowings Proceeds from Issuance of Long-term Debt Debt issuance costs Payments of Debt Issuance Costs Upon redemption of Class A units, at redemption value, value Stock Issued During Period, Value, Conversion of Units Variable Rate Variable Rate [Member] Variable Rate [Member] Aggregate of preferred equity interests Real Estate Investments, Joint Ventures Guarantees and master leases Guarantees And Master Leases Guarantees And Master Leases Variable Rate [Domain] Variable Rate [Domain] Variable Rate [Axis] Variable Rate [Axis] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Commitments and contingencies Commitments and Contingencies ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Subsidiary Subsidiaries [Member] Total, net Finite Lived Intangible Liabilities Net 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 Maturing in March 2026 Maturing in March 2026 [Member] Maturing in March 2026 Deferred compensation shares and options Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Entity Address, State or Province Entity Address, State or Province Unusual or Infrequent Item, or Both [Line Items] Unusual or Infrequent Item, or Both [Line Items] Capitalized interest and debt expense Interest Costs Capitalized Adjustment This element represents Capitalized interest and debt expenses amount. Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Earnings less than distributions Retained Earnings (Accumulated Deficit) Vornado Capital Partners Real Estate Fund Vornado Capital Partners Real Estate Fund [Member] Right-of-use assets Operating Lease, Right-of-Use Asset Reconciliation of Cash and Cash Equivalents and Restricted Cash: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] BMS cleaning fees Building Maintenance Service [Member] Building services provided by whole-owned subsidiary. Summary of changes in level 3 plan assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Cash payments for income taxes Income Taxes Paid Senior Unsecured Notes Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Fair value, schedule of assets and liabilities measures on recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Derivative Liability, Notional Amount Derivative Liability, Notional Amount One Park Avenue One Park Avenue [Member] One Park Avenue Guarantor obligations, maximum exposure, undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted 33-00 Northern Boulevard mortgage loan Three Three - Zero Zero Northern Boulevard Mortgage Loan [Member] Three Three - Zero Zero Northern Boulevard Mortgage Loan [Member] Beginning balance, shares Ending balance, shares Shares, Outstanding Capital contributions Other Ownership Interests, Contributed Capital Preferred shares of beneficial interest: no par value per share; authorized 110,000,000 shares; issued and outstanding 48,793,402 shares Preferred Stock, Value, Issued Vornado deductible, percentage of property value Registrant Deductible Percentage Of Property Value Vornado deductible, percentage of property value Hedging Designation [Domain] Hedging Designation [Domain] Investments in partially owned entities Payments to Acquire Equity Method Investments Total expenses Operating Expenses Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Common shares of beneficial interest: par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Under dividend reinvestment plan, value Stock Issued During Period, Value, Dividend Reinvestment Plan AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] (Expense) benefit from deferred compensation plan liability Mark-to-market Expense (Benefit) of Investments in Deferred Compensation Plan Mark-to-market Expense (Benefit) of Investments in Deferred Compensation Plan Matures in March 2024 Matures in March 2024 [Member] Matures in March 2024 Revenue Revenue from Contract with Customer, Excluding Assessed Tax Measurement Frequency [Domain] Measurement Frequency [Domain] Purchases/additional fundings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Other Identified Intangible Assets Other Identified Intangible Assets [Member] Other Identified Intangible Assets [Member] Matures in March 2021 Matures in March 2021 [Member] Matures in March 2021 Statement Statement [Line Items] Class A Units Owned by Vornado Class A Units Owned By Vornado [Member] Class of Stock [Domain] Class of Stock [Domain] Net unrealized loss on held investments Unrealized Gain (Loss) on Investments Measurement Input Type [Domain] Measurement Input Type [Domain] Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Credit Facility [Axis] Credit Facility [Axis] Debt, Fair Value Debt Instrument, Fair Value Disclosure Earnings per share [Table] Earnings per share [Table] Fee and other income Fee And Other Income [Member] Fee And Other Income [Member] Trade shows Trade Shows [Member] Trade Shows [Member] Preferred shares of beneficial interest: issued shares (shares) Preferred Stock, Shares Issued Deferred leasing costs, accumulated amortization Deferred Leasing And Financing Costs Amortization 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. Land Land Amount of basis points by which vornado underperforms the index Amount of Basis Points by Which Vornado Underperforms the Index Per Annum Amount of Basis Points by Which Vornado Underperforms the Index Per Annum Unusual or Infrequent Items, or Both [Abstract] Unusual or Infrequent Items, or Both [Abstract] Redeemable Class A unit measurement adjustment Redeemable Class A unit measurement adjustment Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Deferred compensation plan Deferred Compensation Liability, Current and Noncurrent Nonrecurring Fair Value, Nonrecurring [Member] Other Other Changes In Accumulated Comprehensive Income Loss [Member] Other Changes In Accumulated Comprehensive Income Loss [Member] Weighted Average Weighted Average [Member] Add: NOI from partially owned entities Net Operating Income (Loss) from Equity Method Investments Net Operating Income (Loss) from Equity Method Investments Contributions: Limited Partners Contributions [Abstract] Earnings per share Earnings per share [Line Items] Entity Small Business Entity Small Business Commitment to fund additional capital to partially owned entities Commitment To Fund Additional Capital To Partially Owned Entities Commitment To Fund Additional Capital To Partially Owned Entities Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Variable billings Operating Lease, Variable Lease Income PENN 11 mortgage loan interest rate swap PENN 11 Interest Rate Swap [Member] PENN 11 Interest Rate Swap Net income per Class A unit (in dollars per unit) Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Debt Disclosure [Text Block] Leases, number of renewal terms Leases, Number of Renewal Terms Leases, Number of Renewal Terms Components of Fixed and Variable Lease Revenues Operating Lease, Lease Income [Table Text Block] Amendment Flag Amendment Flag Schedule Of Earnings Per Share Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] PPIC PPIC [Member] Penn Plaza Insurance Company', our wholly owned consolidated subsidiary, is acting as 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. Excess of investee's fair value over carrying amount Equity Method Investment Fair Value In Excess Of Carrying Amount Equity Method Investment Fair Value In Excess Of Carrying Amount Terminal Capitalization Rate Measurement Input, Terminal Capitalization Rate [Member] Measurement Input, Terminal Capitalization Rate [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 345 Montgomery Street Three Four FIve Montgomery Street [Member] Three Four FIve Montgomery Street [Member] Real estate assets Real Estate [Member] Return on preferred equity, net of our share of the expense Income (Loss) from Equity Method Investments, Preferred Income (Loss) from Equity Method Investments, Preferred Lease revenues Lease Revenue [Member] Lease Revenue [Member] COVID-19 COVID-19 [Member] COVID-19 [Member] Unsecured revolving credit facilities Long-term Line of Credit Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Lessor, operating lease, lease not yet commenced, term of contract Lessor, Operating Lease, Lease Not yet Commenced, Term of Contract Vornado Realty Trust Vornado Realty Trust [Member] Vornado Realty Trust Interest And Debt Expense Interest And Debt Expense [Text Block] This disclosure relates to the details of interest and debt expense of the company. The interest expense relates to secured and unsecured debt of the company Equity Method Investments Equity Method Investments [Table Text Block] Basis of Presentation [Abstract] Basis of Presentation [Abstract] Basis of Presentation [Abstract] New York Stock Exchange NEW YORK STOCK EXCHANGE, INC. [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Distribution to noncontrolling interests / redeemable security holders and noncontrolling interests in consolidated subsidiaries Payments of Ordinary Dividends, Noncontrolling Interest Entity Central Index Key Entity Central Index Key Related Party [Domain] Related Party [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Investments in Partially Owned Properties Partially Owned Properties [Member] Interest rate swaps Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] General Liability General Liability [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of carrying amounts and fair values of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule of Identified Intangible Assets and Intangible Liabilities Schedule of Finite-Lived Intangible Assets [Table Text Block] Fifth Avenue and Times Square JV Fifth Avenue and Times Square JV [Member] Fifth Avenue and Times Square JV [Member] Cash equivalents, carrying amount Cash Equivalents, at Carrying Value Operating Partnership Operating Partnership [Member] Operating Partnership [Member] Accrued capital expenditures included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Other, net Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Net Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Gain Loss Net Investment period for commitments of the Fund, years Investment Period Fund Investment Period Fund Other All Other Except Real Estate Fund [Member] This member represents all other susidiaries excepts for the company's Real Estate Fund Unsecured debt, gross Unsecured Debt, Gross Unsecured Debt, Gross Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Segments [Domain] Segments [Domain] Lease, term (in years) Lessee, Operating Lease, Renewal Term Interest on loans receivable Interest and Fee Income, Loans and Leases Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Real Estate Fund Investments Real Estate Fund [Text Block] Disclosure for Vornado Capital Partners LP and Vornado Capital Partners Parallel LP The Fund Absolute Absolute [Member] Absolute Component [Member] Credit losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] Building Maintenance Service LLC Building Maintenance Service LLC [Member] Building Maintenance Service LLC [Member] Real estate, at cost: Real Estate Investment Property, at Cost [Abstract] Organization [Line Items] Organization [Line Items] [Line Items] for Organization [Table] Interest and Other Investment Income (Loss), Net Investment Income [Table Text Block] Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Amortization of intangible assets Amortization of Intangible Assets SNL US Office REIT Index SNL US Office REIT Index [Member] SNL US Office REIT Index [Member] Common limited partnership interest in the Operating Partnership (percent) Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Exchange [Domain] Exchange [Domain] Insurance sublimit Insurance Sublimit Insurance Sublimit Investments in Partially Owned Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Out of performance plan notional amount Share Based Compensation By Share Based Payment Award Notional Amount The aggregate notional amount of the out performance plan. NBCR Acts NBCR [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. Other liabilities Other Liabilities Segment Information Segment Reporting Disclosure [Text Block] Cash equivalents, fair value Cash and Cash Equivalents, Fair Value Disclosure Weighted average units outstanding, diluted (in shares) Denominator for diluted income per Class A unit - weighted average units Weighted Average Limited Partnership Units Outstanding, Diluted Assets Assets Assets Subsidiary of Regus PLC Subsidiary of Regus PLC [Member] Subsidiary of Regus PLC [Member] Maximum award Share Based Compensation, Maximum Award Share Based Compensation, Maximum Award Real estate fund investments Increase (Decrease) in Real Estate Fund Investments Increase (Decrease) in Real Estate Fund Investments Title of 12(b) Security Title of 12(b) Security Duration of performance measurement period Duration Of Performance Measurement Period The period of time during which the performance of the stock will be evaluated to calculate the earning of the stock based awards. Identified intangible assets, net of accumulated amortization of $90,508 and $93,113 Total, net Finite-Lived Intangible Assets, Net Derivative expiration date Derivative Expiration Date Derivative Expiration Date Subsequent Event Type [Axis] Subsequent Event Type [Axis] Disease Coverage Disease Coverage [Member] Disease Coverage [Member] Rent collected, percent Rent Collected, Percent Rent Collected, Percent Insurance deductible Insurance deductible Insurance deductible Redeemable noncontrolling interests: Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] Other, value Stockholders' Equity, Other Depreciation and amortization (including amortization of deferred financing costs) Depreciation, Depletion and Amortization Preferred stock, liquidation preference per share (in dollars per share/unit) Preferred Stock, Liquidation Preference Per Share Ownership percentage by noncontrolling owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners INCOME PER CLASS A UNIT - DILUTED: Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted [Abstract] Property and Development Activities Property and Development Activities [Member] Property and Development Activities [Member] Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Liabilities Write off of receivables arising from the straight-lining of rents Write off of Operating Lease Receivable Write off of Operating Lease Receivable Investment Type [Axis] Investment Type [Axis] Insurance Insurance [Abstract] Unsecured revolving credit facilities Lines of Credit, Fair Value Disclosure Unfunded commitments of fund Unfunded Commitments Of Fund Unfunded Commitments Of the Fund Deferred Compensation Plan Assets Deferred Compensation Plan Assets [Member] Deferred Compensation Plan Assets Excess of investee's carrying amount over equity in net assets Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] NET INCOME attributable to common shareholders / Class A unitholders Net Income (Loss) Available to Common Stockholders, Basic Level 1 Fair Value, Inputs, Level 1 [Member] Annual rent payments Operating Lease, Expense REVENUES: Real Estate [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Investment fund period expiration date Investment fund expiration date Expiration date of the fund investment in YYYY-MM format. Matures in April 2026 Matures in April 2026 [Member] Matures in April 2026 Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Rental revenues Rental Revenue [Member] Rental Revenue [Member] Reclassification from "development costs and construction in progress" to "220 Central Park South condominium units ready for sale" Real Estate Owned, Transfer to Real Estate Owned Percentage For First Five Years Percentage For First Five Years [Member] Percentage For First Five Years [Member] Debt Instrument [Axis] Debt Instrument [Axis] Additional Capital Additional Paid-in Capital [Member] Other assets Other Assets Other, net Other Net Attributable To Redeemable Noncontrolling Interest Other Net Attributable To Redeemable Noncontrolling Interest Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Distributions Redeemable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Redeemable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Asset Class [Axis] Asset Class [Axis] Development costs and construction in progress Development in Process Capitalization Rate Measurement Input, Cap Rate [Member] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Redemption of Class A units for Vornado common shares, at redemption value Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Adjustment for straight-line rents and amortization of acquired below-market leases and other, net Adjustment for Straight-Line Rents and Amortization of Acquired Below-Market Leases, Net Adjustment for Straight-Line Rents and Amortization of Acquired Below-Market Leases, Net Common shares of beneficial interest: outstanding shares (shares) Common Stock, Shares, Outstanding Entity Information [Line Items] Entity Information [Line Items] Less net loss (income) attributable to noncontrolling interests / consolidated subsidiaries in: Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest [Abstract] INCOME PER CLASS A UNIT - BASIC: Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax [Abstract] Revolving Credit Facility Revolving Credit Facility [Member] Matures in April 2031 Matures in April 2031 [Member] Matures in April 2031 Distributions of capital from partially owned entities Distributions of capital from partially owned entities 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. Variable Interest Entities (VIEs) Variable Interest Entity Disclosure [Text Block] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Required shareholder return under relative component Required Shareholder Return Under Relative Component Required percentage of shareholder return under the Relative plan. If this percentage is not met, then the total award is reduced based on the absolute TSR plan. Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Subsequent Event Subsequent Event [Member] Outstanding letters of credit Letters of Credit Outstanding, Amount Common shares of beneficial interest: authorized shares (shares) Common Stock, Shares Authorized Effect of dilutive securities Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Proceeds received from exercise of employee share options (Vornado stock options) and other Proceeds from Stock Options Exercised Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Value Estimate of Fair Value Measurement [Member] Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Loss Total AOCI Attributable to Parent [Member] Net gains on disposition of wholly owned and partially owned assets Net gains on disposition of wholly owned and partially owned assets Net gains on disposition of wholly owned and partially owned assets Gain (Loss) on Disposition of Assets 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Name of Property [Domain] Name of Property [Domain] Summary Of Activity Of Redeemable Noncontrolling Interests Summary Of Activity Of Redeemable Noncontrolling Interests [Table Text Block] Summary Of Activity Of Redeemable Noncontrolling Interests [Text Block] Out Performance Plan 2021 Out Performance Plan 2021 [Member] Out Performance Plan 2021 AO LTIP units AO LTIP Units [Member] AO LTIP Units Repurchase of shares / Class A units related to stock compensation agreements and related tax withholdings Repurchase of shares related to stock compensation arrangements and related tax withholdings Increase (decrease) in retained earnings associated with the repurchase of shares related to stock compensation arrangements and associated employee tax withholdings. 5.40% Series L Series L Preferred Stock Series L Preferred Stock [Member] 5.40% Series L Cumulative Redeemable Preferred Stock [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Comprehensive (loss) income attributable to Vornado / Vornado Realty L.P. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of changes in fair value of plan assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Redeemable Noncontrolling Interest Operating Partnership Units Series Type [Domain] Capital Unit, Class [Domain] Amortization of below-market leases, net Amortization of Below Market Lease Increase (reduction) in value of interest rate swaps and other Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges And Other, Net of Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges And Other, Net of Tax Interest Rate Cap Interest Rate Cap [Member] Other investments Other equity method investments [Member] Other equity method investments Counterparty Name [Domain] Counterparty Name [Domain] City Area Code City Area Code Legal Entity [Axis] Legal Entity [Axis] Series D cumulative redeemable preferred units - 141,401 units outstanding Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Out-Performance Plan units Out-Performance Plan Units [Member] Out-Performance Plan Units Other Commitments Other Commitments [Abstract] Document Period End Date Document Period End Date Schedule of Dividends Schedule of Dividends Payable [Table Text Block] Mandatorily redeemable instruments (included in other liabilities) Mandatorily Redeemable Preferred Stock, Fair Value Disclosure Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Line Items] Insurance limit per occurrence Insurance Limit Per Occurrence Insurance Limit Per Occurrence Preferred stock, redemption price per share (in dollars per share/unit) Preferred Stock, Redemption Price Per Share Equity in net income (loss) Income (Loss) from Equity Method Investments Preferred shares of beneficial interest: par value per share (in dollars per share) Preferred Stock, No Par Value Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Summary of Revenue Sources by Segment Disaggregation of Revenue [Table Text Block] Operating lease, term of contract Lessee, Operating Lease, Term of Contract Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Hedging Designation [Axis] Hedging Designation [Axis] Loans receivable, measurement input Loans Receivable, Measurement Input Loans Receivable, Measurement Input Prepaid assets Increase (Decrease) in Prepaid Expense Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net income per Class A unit (in dollars per unit) Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Investment fund, extension of term Investment Fund, Extension of Term Investment Fund, Extension of Term Earthquake California Properties Earthquake California Properties [Member] Amount of insurance coverage against damages to property caused by earthquakes in California. 5.25% Series N Series N Preferred Stock Series N Preferred Stock [Member] Series N Preferred Stock Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Entity [Domain] Entity [Domain] Maximum payout Percentage Awards Will Be Reduced if Total Shareholder Return Is Zero or Negative Percentage Awards Will Be Reduced if Total Shareholder Return Is Zero or Negative NOI at share - cash basis NOI at share - cash basis Cash Basis Property-Level NOI Cash Basis Property-Level NOI Designated as Hedging Instrument Designated as Hedging Instrument [Member] Unsecured term loan, net Unsecured Debt Interest And Debt Expense Interest And Debt Expense [Table Text Block] The schedule of interest and debt expense on secured and unsecured debt Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Cover [Abstract] Cover [Abstract] Other Other Segment [Member] Other Member including eliminations, non-core business related activities. Measurement Input Type [Axis] Measurement Input Type [Axis] Redeemable noncontrolling interests' share of above adjustments Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Mortgages payable, gross Notes And Loans Payable Gross Notes And Loans Payable Gross Floating Floating [Member] Floating [Member] Distributions of income from partially owned entities Proceeds from Equity Method Investment, Distribution Identified Intangible Assets and Liabilities Intangible Assets Disclosure [Text Block] Leasehold improvements and equipment Fixtures and Equipment, Gross Affiliated Entity Affiliated Entity [Member] Long term debt Long-term Debt Fixed Rate Fixed Rate [Member] Fixed Rate [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Restricted cash Restricted cash at beginning of period Restricted cash at end of period Restricted Cash and Cash Equivalents Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Matures in May 2021 Matures in May 2021 [Member] Matures in May 2021 Increase (reduction) in value of interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Equity Components [Axis] Equity Components [Axis] NOI - consolidated Net Operating Income (Loss) Cash Basis, Consolidated Net Operating Income (Loss) Cash Basis, Consolidated Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Partnership Interest Partnership Interest [Member] Interest on cash and cash equivalents and restricted cash Interest on Cash and Cash Equivalents and Restricted Cash Interest on Cash and Cash Equivalents and Restricted Cash Balance Sheet Location [Domain] Balance Sheet Location [Domain] Consolidated Entities [Domain] Consolidated Entities [Domain] Equity method effective ownership percentage Equity Method Investment, Effective Ownership Percentage Equity Method Investment, Effective Ownership Percentage Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Number of components of out performance plan Number of Components of Out Performance Plan Number of Components of Out Performance Plan Entity Interactive Data Current Entity Interactive Data Current Insurance deductible percentage of balance of covered loss Insurance Deductible Percentage Of Balance Of Covered Loss Insurance deductible, percentage of balance of a covered loss Management and leasing fees Management And Leasing Fees [Member] Management And Leasing Fees [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Shareholders' Equity/Partners' Capital Stockholders' Equity Note Disclosure [Text Block] Facility fee (percent) Line of Credit Facility, Commitment Fee Percentage Real estate basis difference, carrying amount Real Estate Basis Difference, Carrying Amount Real Estate Basis Difference, Carrying Amount Interest rate swaps Interest Rate Swap [Member] Stock-based Compensation Share-based Payment Arrangement [Policy Text Block] Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Derivative [Table] Derivative [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Other liabilities Increase (Decrease) in Other Operating Liabilities Total Real Estate Investment Property, at Cost Redeemable Noncontrolling Interest, by Legal Entity [Table] Redeemable Noncontrolling Interest, by Legal Entity [Table] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Deferred financing costs, net and other Deferred financing costs, net and other Debt Issuance Costs, Net Percentage After Fifth Anniversary Increase in Percentage After Fifth Anniversary [Member] Increase in Percentage After Fifth Anniversary [Member] Number of reportable segments Number of Reportable Segments Schedule of derivative liabilities at fair value Schedule of Derivative Liabilities at Fair Value [Table Text Block] New York City Economic Development Corporation New York City Economic Development Corporation [Member] New York City Economic Development Corporation [Member] Net investment income Net Investment Income Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Write off of tenant receivables deemed uncollectible Write off of Tenant Receivables Deemed Uncollectible Write off of Tenant Receivables Deemed Uncollectible Dividends paid on common shares / Distributions to Vornado Payments of Ordinary Dividends, Common Stock Interest rate, end of period (percent) Debt Instrument, Interest Rate, Effective Percentage Conversion of Series A preferred shares to common shares / Conversion of Series A preferred units to Class A units, value Stock Issued During Period, Value, Conversion of Convertible Securities Hotel Pennsylvania Hotel Pennsylvania [Member] Domain member used to indicate facts reported for the continuing operations of Hotel Pennsylvania. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Real Estate [Domain] Real Estate [Domain] Receivable arising from the straight-lining of rents Deferred Rent Receivables, Net Below Market Leases Net Of Above Market Leases Below Market Leases Net Of Above Market Leases [Member] Below Market Leases Net Of Above Market Leases [Member] Preferred share dividends / unit distributions Preferred Stock Dividends, Income Statement Impact Depreciation and amortization Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Rate Type [Domain] Rate Type [Domain] Rate Type [Domain] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] Loss from real estate fund investments Loss from real estate fund investments Loss from real estate fund investments Income (loss) from real estate fund investments This element represents the income (loss) from the Real Estate Fund before allocation to noncontrolling interests Lease income Lease revenues Operating Lease, Lease Income Straight-lining of rents Straight Line Rent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Real estate fund investments Aggregate fair value of Real Estate Fund investments (in US Dollars) Real Estate Fund Nondepreciable Real Estate This element represents the real estate assets related to the fund Fixed billings Operating Lease, Lease Income, Lease Payments Office Office Building [Member] Schedule Of Interest And Other Investment Income, Net Interest and Other Income [Table Text Block] Management, leasing and development fees Management Leasing And Development Fees Management Leasing And Development Fees Fair value inputs quantitative information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Vornado Realty L.P. Vornado Realty L.P. [Member] Document Transition Report Document Transition Report Interest rate swaps (included in other assets) Interest Rate Derivative Assets, at Fair Value Numerator: Net Income (Loss) Attributable to Parent [Abstract] Required shareholder return four year Required Shareholder Return Four Year Minimum percentage of shareholder return for four years before any payout is made under the out performance plan. Derivative Asset, Fair Value Derivative Asset, Fair Value, Gross Asset Common shares/units, dividends (in dollars per share) Common shares, dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Debt instrument, amount Debt Instrument, Face Amount Level 2 Fair Value, Inputs, Level 2 [Member] Benchmark [Axis] Benchmark [Axis] Benchmark [Axis] Fair value measurements, nonrecurring Fair Value Measurements, Nonrecurring [Table Text Block] Document Quarterly Report Document Quarterly Report PENN11 PENN11 [Member] PENN11 909 Third Avenue Nine Zero Nine Third Avenue [Member] Nine Zero Nine Third Avenue Asset Class [Domain] Asset Class [Domain] Investment Holdings Investment Holdings [Line Items] Tenant services Tenant Services [Member] Tenant Services [Member] General and Administrative Expense General and Administrative Expense [Member] Total assets Real estate assets Assets, Fair Value Disclosure Equity [Abstract] Equity [Abstract] Under employees' share option plan, shares Stock Issued During Period, Shares, Employee Stock Ownership Plan Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Percent vested, year five Share Based Compensation, Percent Vested, Year Five Share Based Compensation, Percent Vested, Year Five Derivative Asset, Notional Amount Derivative Asset, Notional Amount Non-Cash Investing and Financing Activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Derivative, Swap Rate Derivative, Fixed Interest Rate Distributions to Vornado General Partners' Capital Account, Period Distribution Amount Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible List] Other liabilities Other Liabilities [Member] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Entities [Table] Entities [Table] Organization [Table] Organization [Table] Organization [Table] Credit Facility [Domain] Credit Facility [Domain] Recently Issued Accounting Literature Accounting Standards Update and Change in Accounting Principle [Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Schedule of Future Amortization Expense of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Proceeds from sale of condominium units at 220 Central Park South Proceeds from Sale of Real Estate Held-for-investment Weighted average shares outstanding, diluted (in shares) Denominator for diluted income per share - weighted average shares and assumed conversions (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Domain] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Domain] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Domain] Net income per common share (in dollars per share) Earnings Per Share, Basic Partially Owned Office Buildings Partially owned office buildings [Member] Partially Owned Office Buildings Entity File Number Entity File Number Debt Disclosure [Abstract] Debt Disclosure [Abstract] Unsecured term loan Senior Unsecured Term Loan [Member] Senior Unsecured Term Loan [Member] Insurance maximum coverage limit in aggregate Insurance Maximum Coverage In Aggregate Insurance maximum coverage limit in aggregate. Unsecured Term Loan Unsecured Debt [Member] Percentage of shareholder return under which 50% of awards will be earned Percentage Of Shareholder Return Under Which No Awards Will Be Earned Percentage of shareholder return required under any plan before any payments will be awarded. Investment Holdings [Table] Investment Holdings [Table] Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Contributions from noncontrolling interests / noncontrolling interests in consolidated subsidiaries Proceeds from Noncontrolling Interests Repayments of borrowings Repayments of Long-term Debt Dividends on common shares Dividends, Common Stock New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Share-based compensation expense Share-based Payment Arrangement, Expense New York New York Segment [Member] Domain member used to indicate facts reported for the New York Office Segment. Dividends paid on preferred shares / Distributions to preferred unitholders Payments of Ordinary Dividends, Preferred Stock and Preference Stock Balance Sheet Location [Axis] Balance Sheet Location [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Common shares of beneficial interest: $0.04 par value per share; authorized 250,000,000 shares; issued and outstanding 191,464,658 and 191,354,679 shares Common Stock, Value, Issued Moynihan Train Hall reimbursement from Empire State Development Proceeds from Construction Loans Payable Finite-Lived Intangible Assets and Liabilities Finite-Lived Intangible Assets [Line Items] Other comprehensive income of nonconsolidated subsidiaries Our Share Of Partially Owned Entities Oci Adjustments This element represents the company's pro-rata share of other comprehensive income (loss) adjustments related to non-consolidated subsidiaries Document Fiscal Year Focus Document Fiscal Year Focus Net income attributable to nonredeemable noncontrolling interests in consolidated subsidiaries Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Component Type [Axis] Deferred compensation plan assets (included in restricted cash and other assets) Deferred Compensation Plan Assets Farley Office and Retail Farley Office and Retail Building [Member] Farley Office and Retail Building [Member] Entity Current Reporting Status Entity Current Reporting Status Closing share price (in dollars per share) Sale of Stock, Price Per Share Crowne Plaza Times Square Hotel Joint Venture Crowne Plaza Times Square Hotel Joint Venture [Member] Regus PLC Regus PLC [Member] Regus PLC [Member] Development costs and construction in progress Payments to Develop Real Estate Assets Deferred compensation shares and options, shares Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Terrorism Acts Terrorism Acts [Member] Terrorism Acts [Member] Income (loss) from deferred compensation plan assets Gain Loss of investments in deferred compensation plan Gain Loss of investments in deferred compensation plan Noncontrolling interests in consolidated subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Preferred stock, dividend rate, per-dollar-amount (in dollars per share) Preferred Stock, Dividend Rate, Per-Dollar-Amount Derivative, Interest Rate Derivative, Variable Interest Rate Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Common shares of beneficial interest: issued shares (shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value Ownership common shares, investee (in shares) Investment Owned, Balance, Shares Identified intangible liabilities (included in deferred revenue): Identified Intangible Liabilities [Abstract] Identified Intangible Liabilities [Abstract] Lease liabilities Operating Lease, Liability Redeemable Noncontrolling Interests Rollforward Redeemable Noncontrolling Interests Rollforward [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Tenant and other receivables Accounts Receivable, after Allowance for Credit Loss Basis Of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Tenant and other receivables Increase (Decrease) in Accounts Receivable Debt Instrument Debt Instrument [Line Items] Common shares issued: / Class A Units issued to Vornado Common Shares Issued [Abstract] NOI attributable to noncontrolling interests in consolidated subsidiaries Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries Net Operating Income (Loss), Portion Attributable to Noncontrolling Interest, Total Net Operating Income (Loss), Portion Attributable to Noncontrolling Interest, Total Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total Vornado shareholders' / partners equity Stockholders' Equity Attributable to Parent Write-off of fully depreciated assets Write Off Of Fully Amortized And Depreciated Assets This element represents the decrease in assets due to the write off of fully depreciated assets Organization Nature of Operations [Text Block] Total liabilities, redeemable noncontrolling interests / partnership units and equity Liabilities and Equity Buildings and improvements Buildings and Improvements, Gross Loss Contingencies Loss Contingencies [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Address, City or Town Entity Address, City or Town Vornado stock options, Vornado restricted stock awards, OP Units, AO LTIP Units and OPPs Stock Options, Restricted Stock Awards, OP Units, AO LTIP Units and OPPs [Member] Stock Options, Restricted Stock Awards, OP Units, AO LTIP Units and OPPs Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] All Risk And Rental Value All Risk And Rental Value [Member] Amount of all risk and rental value insurance coverage against damages to property. Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Insurance Coverage Type Name [Domain] Insurance Coverage Type Name [Domain] Unobservable Quantitative Input Unobservable Quantitative Input [Abstract] Other Assets Other Assets [Member] General and administrative General and administrative expense General and Administrative Expense Class A units - 14,004,370 and 13,583,607 units outstanding Redemption value of redeemable Class A units Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount Weighted average common share / class A unit equivalents of excluded dilutive securities due to anti-dilutive effect Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Earnings allocated to unvested participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Interest and Other Income [Abstract] Interest and Other Income [Abstract] Other non-cash adjustments Other Noncash Income (Expense) Property rentals Property Rentals [Member] Property Rentals [Member] Real Estate Fund Investments Real Estate, Policy [Policy Text Block] Cumulative Redeemable Preferred Unit Cumulative Redeemable Preferred Unit [Member] Cumulative Redeemable Preferred Unit [Member] Debt instrument, default interest, percentage Debt Instrument, Default Interest, Percentage Debt Instrument, Default Interest, Percentage Equity Component [Domain] Equity Component [Domain] Conversion Feature [Axis] Conversion Feature [Axis] NOI from partially owned entities Net Operating Income (Loss) Cash Basis, Partially Owned Entities Net Operating Income (Loss) Cash Basis, Partially Owned Entities 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Entity Tax Identification Number Entity Tax Identification Number Fair value below cost Excess of fair value below cost Investment Owned Unrecognized Unrealized Appreciation Value The amount of excess fair value of investments over it's cost. Decrease in fair value of marketable securities Market-to-market decrease in the fair value of marketable security (sold on January 23, 2020) Marketable Securities, Unrealized Gain (Loss) Stock-based Compensation Share-based Payment Arrangement [Text Block] Net income attributable to Vornado / Vornado Realty L.P. Net income attributable to Vornado / Vornado Realty L.P. Net Income (Loss) Attributable to Parent Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax LIBOR London Interbank Offered Rate (LIBOR) [Member] Credit losses on loans receivable Credit losses on loans receivable Financing Receivable, Credit Loss, Expense (Reversal) Investment, Name [Domain] Investment, Name [Domain] Class A Unit Capital Unit, Class A [Member] Number of extensions Number of Extensions Number of Extensions Debt Covenant [Axis] Debt Covenant [Axis] Debt Covenant [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date EXPENSES: Operating Expenses [Abstract] Less comprehensive loss (income) loss attributable to noncontrolling interests in noncontrolling interests / consolidated subsidiaries Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings Per Share [Abstract] Earnings Per Share [Abstract] Interest rate swaps (included in other liabilities) Interest Rate Derivative Liabilities, at Fair Value Relative Relative [Member] Relative [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Distributions: Distributions [Abstract] Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests [Text Block] Redeemable Noncontrolling Interests [Text Block] Shareholders' / Partner's Equity Stockholders' Equity Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five Document Fiscal Period Focus Document Fiscal Period Focus Loans receivable (included in investments in partially owned entities and in other assets) Loans Receivable, Fair Value Disclosure Default amount Debt Instrument, Debt Default, Amount Carrying amount of investments in partially owned entities Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Liabilities Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Liabilities Clawback payment Required Clawback Payment To Limited Partners At Liquidation Required Clawback Payment To Limited Partners At Liquidation Numerator for diluted income per share / Class A unit Net Income (Loss) Available to Common Stockholders, Diluted 85 Tenth Avenue Eight Five Tenth Avenue [Member] Eight Five Tenth Avenue [Member] Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Mortgages Mortgages [Member] Loans Receivable Loans Receivable [Member] Benchmark [Domain] Benchmark [Domain] [Domain] for Benchmark [Axis] Joint Venture Corporate Joint Venture [Member] Entity Filer Category Entity Filer Category 220 Central Park South condominium units ready for sale Real Estate Held-for-sale Common Shares of beneficial interest, $.04 par value per share Common Shares Common Stock [Member] Operating Partnership Net income attributable to redeemable partnership units Net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Product and Service [Domain] Product and Service [Domain] Equity in net income of partially owned entities Income Loss From Equity Method Investments Including Fees Earned Including Discontinued Operations This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied, including the management or other fees earned. Preferred stock, dividend rate, percentage (percent) Preferred Stock, Dividend Rate, Percentage Fair value of Series G-1 through G-4 convertible preferred units and Series D-13 cumulative redeemable preferred units Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Fair Value of Shares Debt Covenant [Domain] Debt Covenant [Domain] [Domain] for Debt Covenant [Axis] Interest and other investment income (loss), net Interest and other investment income (loss), net Interest and other investment (income) loss, net Interest and other investment (loss) income, net This element represents interest and other investment loss income net of tax incuding impairment losses, mark-to-market adjustments for derivatives or mark-to-market investments in deferred compensation. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Gross amount Finite-Lived Intangible Assets, Gross Crowne Plaza Time Square Hotel Crowne Plaza Time Square Hotel [Member] Crowne Plaza Time Square Hotel [Member] Schedule Of Equity Method Investments Schedule of Equity Method Investments [Line Items] Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Domain] Contributions Noncontrolling Interest, Increase From Limited Partners' Contribution Increase in noncontrolling interest balance due to the limited partners' contributions Senior unsecured notes, net Senior Notes Employee stock options and restricted stock awards Employee Stock Options and Restricted Stock Awards [Member] Employee Stock Options and Restricted Stock Awards Debt instrument, interest rate, stated percentage (percent) Debt Instrument, Interest Rate, Stated Percentage Percentage of employees returned from furlough Percentage of Employees Returned from Furlough Percentage of Employees Returned from Furlough Common Class A Common Class A [Member] Conversion Feature [Domain] Conversion Feature [Domain] Name of Property [Axis] Name of Property [Axis] INCOME PER COMMON SHARE - DILUTED: Earnings Per Share, Diluted [Abstract] Other income Product and Service, Other [Member] Net increase in cash and cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Consolidated subsidiaries Less loss attributable to noncontrolling interests in consolidated subsidiaries Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Accumulated other comprehensive (loss) income of nonconsolidated subsidiaries Pro Rata Share Of Non Consolidated Subsidiaries Oci [Member] Pro-rata share of non consolidated subsidiaries' OCI Distributions to preferred shareholders / unitholders (see Note 13 for distributions per unit amounts) Dividends, Preferred Stock Interest and Debt Expense [Abstract] Interest and Debt Expense [Abstract] Real estate fund investments Real Estate Funds [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Weighted average shares outstanding, basic (in shares) Denominator for basic income per share - weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Accumulated amortization Finite Lived Intangible Liability Accumulated Amortization 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. Spread over LIBOR (percent) Debt Instrument, Basis Spread on Variable Rate Investments in partially owned entities Carrying amount of investments in partially owned entities Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests [Policy Text Block] Redeemable Noncontrolling Interests Policy [Text Block] Ownership [Axis] Ownership [Axis] Income from partially owned entities Our share of net income (loss) Income from partially owned entities Income Loss From Equity Method Investments Including Fees Earned Weighted average units outstanding, basic (in shares) Denominator for basic income per Class A unit - weighted average units and assumed conversions Weighted Average Limited Partnership Units Outstanding, Basic Unsecured Revolving Credit Facilities Unsecured Revolving Credit Facilities [Member] Unsecured Revolving Credit Facilities [Member] Loss Contingencies [Table] Loss Contingencies [Table] Ownership [Domain] Ownership [Domain] Carrying Amount Reported Value Measurement [Member] Income (loss) from real estate fund investments net of noncontrolling interests in consolidated subsidiaries Net Income (Loss) from Real Estate Investment Partnership SNL US Retail Index SNL US Retail Index [Member] SNL US Retail Index [Member] Number of investments held by fund (investment) Number Of Investments Held By Fund Number Of Investments Held By Fund during the year. Equity method ownership percentage Equity method ownership percentage Equity Method Investment, Ownership Percentage Revenue Recognition Revenue from Contract with Customer [Text Block] Cash payments for interest, excluding capitalized interest of $10,267 and $11,913 Interest Paid, Excluding Capitalized Interest, Operating Activities Term of the Fund, years Equity Commitment Fund Term Equity Commitment Fund Term, in years Total equity Beginning balance, value Ending balance, value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Additional capital Additional Paid in Capital 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Revenues Total revenues Revenues Class of Stock [Axis] Class of Stock [Axis] Income tax expense Income tax expense Income Tax Expense (Benefit) Schedule of derivative assets at fair value Schedule of Derivative Assets at Fair Value [Table Text Block] Investors Investors [Member] Investors [Member] Cash and cash equivalents and restricted cash at beginning of period Cash and cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Redeemable Class A unit measurement adjustment Adjustments To Reflect Redeemable Class Operating Partnership Units Adjustments to reflect redeemable Class A Operating Partnership units Redeemable Noncontrolling Interest Operating Partnership Units Series Type [Axis] Capital Units by Class [Axis] Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure 5.70% Series K Series K Preferred Stock Series K Preferred Stock [Member] Net income per common share (in dollars per share) Earnings Per Share, Diluted Variable Interest Entities Variable Interest Entity [Line Items] Local Phone Number Local Phone Number Financial Assets And Liabilities Not Measured At Fair Value Financial Assets And Liabilities Not Measured At Fair Value [Abstract] Rate Type [Axis] Rate Type [Axis] Rate Type [Axis] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Outstanding Partnership Units held by Third Parties (shares) Temporary Equity, Shares Outstanding Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Insurance limit per property Insurance Limit Per Property Insurance limit per property. Derivative [Line Items] Derivative [Line Items] Long-term debt, gross Debt, Carrying Amount Long-term Debt, Gross Capitalized interest Interest Paid, Capitalized, Investing Activities Schedule of Debt Schedule of Long-term Debt Instruments [Table Text Block] NOI at share NOI at share Operating Income Loss Cash Basis Represents cash basis of Net Operating Income which is before allocation to the noncontrolling interest of the Operating Partnership. Entity Address, Address Line One Entity Address, Address Line One Restricted Cash Restricted Cash [Member] Restricted Cash [Member] Under employees' share option plan, value Stock Issued During Period, Value, Employee Stock Ownership Plan Deferred revenue Contract with Customer, Liability Other assets Increase (Decrease) in Other Operating Assets Entity Emerging Growth Company Entity Emerging Growth Company Convertible Preferred Stock Convertible Preferred Stock [Member] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Required shareholder return per year Required Shareholder Return Per Year Minimum percentage of shareholder return per year before any payout is made under the out performance plan. Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Table] Derivative Liability, Fair Value Derivative Liability, Fair Value, Gross Liability Award Type [Axis] Award Type [Axis] Award Type [Axis] Identified intangible assets, accumulated amortization Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Other Other Debt [Member] Other Debt [Member] Amortization of deferred financing costs Amortization of Debt Issuance Costs Maximum Maximum [Member] Operating Operating expenses Operating Costs and Expenses Preferred shares of beneficial interest: authorized shares (shares) Preferred Stock, Shares Authorized Non-controlling Interests in Consolidated Subsidiaries Noncontrolling Interest [Member] COVID-19 Pandemic Unusual or Infrequent Items, or Both, Disclosure [Text Block] Unearned Out-Performance Plan awards acceleration Unearned Out-Performance Plan Unearned Out-Performance Plan Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Earnings Less Than Distributions Retained Earnings [Member] Preferred shares of beneficial interest: outstanding shares (shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Write-off of lease receivables deemed uncollectible Less: write-off of straight-line rent and tenant receivables deemed uncollectible Financing Receivable, Allowance for Credit Loss, Writeoff Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Net unrealized loss on held investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized Gain (Loss) On Held Investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized Gain (Loss) On Held Investments 5.25% Series M Series M Preferred Stock Series M Preferred Stock [Member] Series M Preferred Stock [Member] Award Type [Domain] Award Type [Domain] Investment Type Categorization [Domain] Investments [Domain] Derivative, Basis Spread on Variable Rate Derivative, Basis Spread on Variable Rate Number of employees furloughed Number of Employees Furloughed Number of Employees Furloughed Redeemable Preferred Stock Redeemable Preferred Stock [Member] Entity Trading Symbol Trading Symbol Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Length of extension available (years) Length Of Extension Available The term of the extension available, in years Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Construction commitment Other Commitment Transaction related costs and other Transaction related costs and other Transaction Related Costs and Other Transaction Related Costs and Other Partners' capital General Partners' Capital Account Non-Certified Acts of Terrorism Non-Certified Acts of Terrorism [Member] Non-Certified Acts of Terrorism [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Non cash adjustments for straight-line rents, amortization of acquired below-market leases, net and other Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net, and other Straightline rents and other Adjustments Amount of the non cash adjustment to straight-line rents, amortization of acquired below-market leases, net and other. Less accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Total contractual operating lease billings Operating Lease, Contractual Lease Income Operating Lease, Contractual Lease Income Income Per Share/Income Per Class A Unit Earnings Per Share [Text Block] Insurance Coverage Type Name [Axis] Insurance Coverage Type Name [Axis] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Total redeemable noncontrolling interests Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Entity Shell Company Entity Shell Company 7 West 34th Street Seven West 34th Street [Member] New York 7 West 34th Street [Member] Retail Retail Site [Member] Segment Information Segment Reporting Information [Line Items] Recurring Fair Value, Recurring [Member] Equity method investment fair value Equity Method Investment, Quoted Market Value Real estate, net Real Estate Investment Property, Net Recently Issued Accounting Literature New Accounting Pronouncements, Policy [Policy Text Block] Discount Rate Measurement Input, Discount Rate [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] INCOME PER COMMON SHARE - BASIC: Earnings Per Share, Basic [Abstract]