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Investments in Partially Owned Entities - Debt (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities $ 27,439,213 $ 29,443,128
Equity Method Investment Prorata Share Debt Of Partially Owned Entities Excluding Our Pro Rata Share Of Lnr Liabilities Related To Cmbs And Cdo 3,690,125 3,998,929
Tcg Urban Infrastructure Holdings [Member] | Minimum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, Start 2013  
Tcg Urban Infrastructure Holdings [Member] | Maximum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, End 2022  
Toys R Us [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 32.50%  
Debt Instrument, Interest Rate at Period End 7.71%  
Equity Method Investment Debt Of Partially Owned Entities 5,294,567 5,683,733
Toys R Us [Member] | Minimum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, Start 2013  
Toys R Us [Member] | Maximum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, End 2021  
Alexanders Inc [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 32.40%  
Debt Instrument, Interest Rate at Period End 3.85%  
Equity Method Investment Debt Of Partially Owned Entities 1,061,953 1,065,916
Alexanders Inc [Member] | Minimum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, Start 2014  
Alexanders Inc [Member] | Maximum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, End 2018  
Lexington Realty Trust [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 0 1,994,179
LNR [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity method ownership percentage 26.20%  
Equity Method Investment Debt Of Partially Owned Entities 91,119,220 97,521,521
LNR [Member] | Minimum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, Start 2013  
LNR [Member] | Maximum [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Maturity, Range, End 2031  
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 383,804 309,787
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 5.38%  
Equity Method Investment Debt Of Partially Owned Entities 90,735,416 97,211,734
Partially owned office buildings [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 2,752,947 2,731,893
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 1,124,402 1,109,700
Partially owned office buildings [Member] | Park Avenue 280 [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 738,240 738,228
Partially owned office buildings [Member] | Washington DC Office 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 292,700 292,700
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 250,000 250,000
Partially owned office buildings [Member] | Madison Avenue 330 [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 1.70%  
Equity Method Investment Debt Of Partially Owned Entities 150,000 150,000
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 69,906 70,127
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 20,088 20,434
Partially owned office buildings [Member] | Other Mortgage Notes Payable Collateralized By Real Estate [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Debt Instrument, Interest Rate at Period End 6.03%  
Equity Method Investment Debt Of Partially Owned Entities 76,611 69,704
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) 01/15  
Debt Instrument, Interest Rate at Period End 1.45%  
Equity Method Investment Debt Of Partially Owned Entities 31,000 31,000
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%  
Debt Instrument, Interest Rate at Period End 13.51%  
Equity Method Investment Debt Of Partially Owned Entities 238,359 236,579
Other equity method investments [Member]
    
Schedule Of Long Term Debt Equity Method Investments [Line Items]    
Equity Method Investment Debt Of Partially Owned Entities 1,149,992 1,150,543
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 159,459 159,896
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 $ 990,533 $ 990,647