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Investments in Partially Owned Entities - Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities $ 29,443,128,000 $ 37,531,298,000
Equity Method Investment Prorata Share Debt Of Partially Owned Entities Excluding Our Pro Rata Share Of Lnr Liabilities Related To Cmbs And Cdo 3,998,929,000 4,199,145,000
Toys R Us [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 32.60% 32.70%
Maturity, Range, Start 2013  
Maturity, Range, End 2021  
Debt Instrument, Interest Rate at Period End 7.34%  
Equity Method Investment Debt Of Partially Owned Entities 5,683,733,000 6,047,521,000
Alexanders Inc [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 32.40%  
Maturity, Range, Start 2013  
Maturity, Range, End 2018  
Spread Over LIBOR 1.00%  
Debt Instrument, Interest Rate at Period End 3.87%  
Equity Method Investment Debt Of Partially Owned Entities 1,065,916,000 1,330,932,000
Lexington Realty Trust [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 10.50% 12.00%
Maturity, Range, Start 2015  
Maturity, Range, End 2037  
Debt Instrument, Interest Rate at Period End 5.29%  
Equity Method Investment Debt Of Partially Owned Entities 1,994,179,000 1,712,750,000
LNR [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 26.20%  
Maturity, Range, Start 2013  
Maturity, Range, End 2031  
Equity Method Investment Debt Of Partially Owned Entities 97,521,521,000 127,701,840,000
LNR [Member] | LNR mortgage notes payable [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument, Interest Rate at Period End 4.62%  
Equity Method Investment Debt Of Partially Owned Entities 309,787,000 353,504,000
LNR [Member] | Liabilities Of Consolidated CMBS And CDO Trusts [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument, Interest Rate at Period End 5.40%  
Equity Method Investment Debt Of Partially Owned Entities 97,211,734,000 127,348,336,000
Partially owned office buildings [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 2,731,893,000 2,686,010,000
Partially owned office buildings [Member] | Other Equity Method Investments Other [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument, Interest Rate at Period End 6.37%  
Partially owned office buildings [Member] | Fifth Avenue 666 [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 49.50%  
Debt Instrument Maturity Date (String) 02/19  
Debt Instrument, Interest Rate at Period End 6.76%  
Equity Method Investment Debt Of Partially Owned Entities 1,109,700,000 1,035,884,000
Partially owned office buildings [Member] | Mezzanine Loans 280 Park Avenue [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 49.50%  
Debt Instrument Maturity Date (String) 06/16  
Debt Instrument, Interest Rate at Period End 6.65%  
Equity Method Investment Debt Of Partially Owned Entities 738,228,000 737,678,000
Partially owned office buildings [Member] | Warner Building [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 55.00%  
Debt Instrument Maturity Date (String) 05/16  
Debt Instrument, Interest Rate at Period End 6.26%  
Equity Method Investment Debt Of Partially Owned Entities 292,700,000 292,700,000
Partially owned office buildings [Member] | One Park Avenue [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 30.30%  
Debt Instrument Maturity Date (String) 03/16  
Debt Instrument, Interest Rate at Period End 5.00%  
Equity Method Investment Debt Of Partially Owned Entities 250,000,000 250,000,000
Partially owned office buildings [Member] | Madison Avenue [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 25.00%  
Debt Instrument Maturity Date (String) 06/15  
Debt Instrument, Interest Rate at Period End 1.71%  
Equity Method Investment Debt Of Partially Owned Entities 150,000,000 150,000,000
Partially owned office buildings [Member] | Fairfax Square [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 20.00%  
Debt Instrument Maturity Date (String) 12/14  
Debt Instrument, Interest Rate at Period End 7.00%  
Equity Method Investment Debt Of Partially Owned Entities 70,127,000 70,974,000
Partially owned office buildings [Member] | Rosslyn Plaza [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument Maturity Date (String) 01/12  
Equity Method Investment Debt Of Partially Owned Entities 0 56,680,000
Partially owned office buildings [Member] | West 57th Street [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 50.00%  
Debt Instrument Maturity Date (String) 02/14  
Debt Instrument, Interest Rate at Period End 4.94%  
Equity Method Investment Debt Of Partially Owned Entities 20,434,000 21,864,000
Partially owned office buildings [Member] | Other mortgage notes payable collateralized by real estate [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 69,704,000 70,230,000
Partially owned office buildings [Member] | Washington DC Office 1101 17th Street [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 55.00%  
Debt Instrument Maturity Date (String) 01/18  
Debt Instrument, Interest Rate at Period End 1.46%  
Equity Method Investment Debt Of Partially Owned Entities 31,000,000 0
India real estate ventures [Member] | Tcg Urban Infrastructure Holdings [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 25.00%  
Maturity, Range, Start 2013  
Maturity, Range, End 2022  
Debt Instrument, Interest Rate at Period End 13.22%  
Equity Method Investment Debt Of Partially Owned Entities 236,579,000 226,534,000
Other equity method investments [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 1,150,543,000 1,495,403,000
Other equity method investments [Member] | Verde Realty Operating Partnership [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 0 340,378,000
Other equity method investments [Member] | Monmouth Mall [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 50.00%  
Debt Instrument Maturity Date (String) 09/15  
Debt Instrument, Interest Rate at Period End 5.44%  
Equity Method Investment Debt Of Partially Owned Entities 159,896,000 162,153,000
Other equity method investments [Member] | Other Equity Method Investments Other [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument, Interest Rate at Period End 5.02%  
Equity Method Investment Debt Of Partially Owned Entities $ 990,647,000 $ 992,872,000