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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Equity Securities $ 184,991us-gaap_MarketableSecurities $ 206,323us-gaap_MarketableSecurities
Available-for-sale Equity Securities, Amortized Cost Basis 72,549us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis 72,549us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Available-for-sale Securities, Gross Unrealized Gain 112,442us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax 133,774us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Lexington Realty Trust [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Equity Securities 181,550us-gaap_MarketableSecurities
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember		 202,789us-gaap_MarketableSecurities
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember
Available-for-sale Equity Securities, Amortized Cost Basis 72,549us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember		 72,549us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember
Available-for-sale Securities, Gross Unrealized Gain 109,001us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember		 130,240us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentHoldingAxis
= vno_LexingtonRealtyTrustMember
Other Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Equity Securities 3,441us-gaap_MarketableSecurities
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember		 3,534us-gaap_MarketableSecurities
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember
Available-for-sale Equity Securities, Amortized Cost Basis 0us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember		 0us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain $ 3,441us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember		 $ 3,534us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentHoldingAxis
= vno_OtherEquitySecuritiesMember