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Investments in Partially Owned Entities (One Park Avenue and 61 Ninth Avenue) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Jun. 26, 2014
Jul. 23, 2014
sqft
Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items]        
Aggregate fair value of Real Estate Fund investments (in US Dollars) $ 513,973vno_RealEstateFundNondepreciableRealEstate     $ 667,710vno_RealEstateFundNondepreciableRealEstate
Notes And Loans Payable 9,551,700us-gaap_NotesAndLoansPayable     8,331,993us-gaap_NotesAndLoansPayable
Lease expiration term 30 years      
One Park Avenue [Member]        
Schedule Of Equity Method Investments [Line Items]        
Aggregate fair value of Real Estate Fund investments (in US Dollars)   560,000vno_RealEstateFundNondepreciableRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		    
Maturity, Range, End   March 2016    
One Park Avenue [Member] | Mortgage loan at 4.995% Matures 2016 [Member]        
Schedule Of Equity Method Investments [Line Items]        
Notes And Loans Payable   250,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= vno_MortgageLoanAtFourPointNineNineFivePercentMatures2016Member
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		    
Interest Rate, End of Period (in percentage)   4.995%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= vno_MortgageLoanAtFourPointNineNineFivePercentMatures2016Member
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		    
One Park Avenue [Member] | Vornado Realty Trust [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity Method Investment Ownership Additional Investment   22,700vno_EquityMethodInvestmentOwnershipAdditionalInvestment
/ dei_LegalEntityAxis
= vno_VornadoRealtyTrustMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		    
Equity method ownership percentage   55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= vno_VornadoRealtyTrustMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		   46.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= vno_VornadoRealtyTrustMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember
One Park Avenue [Member] | Co Venture [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method ownership percentage   45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CoVenturerMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_OneParkAvenueMember		    
Sixty One Ninth Avenue Property [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method ownership percentage     50.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_SixtyOneNinthAvenuePropertyMember		  
Lease expiration term     99 years  
Square Footage Of Real Estate Property     130,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_SixtyOneNinthAvenuePropertyMember		  
Estimated Development Cost     $ 125,000vno_EstimatedDevelopmentCost
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= vno_SixtyOneNinthAvenuePropertyMember