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Fair Value Measurements (Narratives) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Investments
Dec. 31, 2013
Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real Estate Fund investments (in US Dollars) $ 513,973,000vno_RealEstateFundNondepreciableRealEstate $ 667,710,000vno_RealEstateFundNondepreciableRealEstate
Toys R Us [Member] | Discounted Cash Flow Methodology [Member]    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple 5.75us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_DiscountedCashFlowMethodologyMember		  
Financial Projections Period 5 years  
Discount rates 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_DiscountedCashFlowMethodologyMember		  
Fair Value Inputs Tax Rate 38.00%vno_FairValueInputsTaxRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_DiscountedCashFlowMethodologyMember		  
Minimum [Member] | Toys R Us [Member] | Market Multiple Methodology [Member]    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple 5.75us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		  
Minimum [Member] | Toys R Us [Member] | Comparable Sales Methodology [Member]    
Fair Value Inputs [Abstract]    
Fair Value Assumptions, Sales Of Comparable Companies (in US Dollars) 150,000,000vno_FairValueAssumptionsSalesOfComparableCompanies
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_ComparableSalesMethodologyMember		  
Minimum [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]    
Fair Value Inputs [Abstract]    
Fair Value Assumptions Expiration Periods 1 year  
Fair Value Assumptions, Expected Volatility Rate 24.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_BlackScholesValuationAnalysisMember		  
Maximum [Member] | Toys R Us [Member] | Market Multiple Methodology [Member]    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple 6.5us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		  
Maximum [Member] | Toys R Us [Member] | Comparable Sales Methodology [Member]    
Fair Value Inputs [Abstract]    
Fair Value Assumptions, Sales Of Comparable Companies (in US Dollars) 3,000,000,000vno_FairValueAssumptionsSalesOfComparableCompanies
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_ComparableSalesMethodologyMember		  
Maximum [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]    
Fair Value Inputs [Abstract]    
Fair Value Assumptions Expiration Periods 3 years  
Fair Value Assumptions, Expected Volatility Rate 29.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= vno_ToysRUsMember
/ us-gaap_ValuationTechniqueAxis
= vno_BlackScholesValuationAnalysisMember		  
Weighted Average [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]    
Fair Value Inputs [Abstract]    
Fair Value Assumptions Expiration Periods 2 years  
Real Estate Fund [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number Of Investments Held By Fund 7vno_NumberOfInvestmentsHeldByFund
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember		 9vno_NumberOfInvestmentsHeldByFund
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
Real Estate Fund investments (in US Dollars) 513,973,000vno_RealEstateFundNondepreciableRealEstate
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember		 667,710,000vno_RealEstateFundNondepreciableRealEstate
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
Excess of fair value over cost $ 176,899,000vno_InvestmentOwnedUnrecognizedUnrealizedAppreciationValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember		  
Real Estate Fund [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Anticipated Investment Holding Period 0 years 9 months 18 days  
Fair Value Inputs [Abstract]    
Discount rates 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Real Estate Fund [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Anticipated Investment Holding Period 6 years 0 months 0 days  
Fair Value Inputs [Abstract]    
Discount rates 17.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Real Estate Fund [Member] | Weighted Average [Member]    
Fair Value Inputs [Abstract]    
Discount rates 13.70%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember