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Investments in Partially Owned Entities - Debt (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 26, 2014
One Park Avenue [Member]
Jun. 30, 2014
Toys R Us [Member]
Dec. 31, 2013
Toys R Us [Member]
Jun. 30, 2014
Toys R Us [Member]
Minimum [Member]
Jun. 30, 2014
Toys R Us [Member]
Maximum [Member]
Jun. 30, 2014
Alexanders Inc [Member]
Dec. 31, 2013
Alexanders Inc [Member]
Jun. 30, 2014
Alexanders Inc [Member]
Minimum [Member]
Jun. 30, 2014
Alexanders Inc [Member]
Maximum [Member]
Jun. 30, 2014
Partially owned office buildings [Member]
Dec. 31, 2013
Partially owned office buildings [Member]
Jun. 30, 2014
Partially owned office buildings [Member]
Minimum [Member]
Jun. 30, 2014
Partially owned office buildings [Member]
Maximum [Member]
Jun. 30, 2014
India real estate ventures [Member]
Minimum [Member]
Jun. 30, 2014
India real estate ventures [Member]
Maximum [Member]
Jun. 30, 2014
India real estate ventures [Member]
Tcg Urban Infrastructure Holdings [Member]
Dec. 31, 2013
India real estate ventures [Member]
Tcg Urban Infrastructure Holdings [Member]
Jun. 30, 2014
India real estate ventures [Member]
Tcg Urban Infrastructure Holdings [Member]
Minimum [Member]
Jun. 30, 2014
India real estate ventures [Member]
Tcg Urban Infrastructure Holdings [Member]
Maximum [Member]
Jun. 30, 2014
Other equity method investments [Member]
Dec. 31, 2013
Other equity method investments [Member]
Jun. 30, 2014
Other equity method investments [Member]
Minimum [Member]
Jun. 30, 2014
Other equity method investments [Member]
Maximum [Member]
Schedule Of Equity Method Investments [Line Items]                                                  
Equity method ownership percentage       32.60%       32.40%               4.10% 36.50% 25.00%              
Maturity, Range, Start           2014       2015       2014           2014       2014  
Maturity, Range, End     March 2016       2021       2021       2023           2026       2023
Debt Instrument, Interest Rate at Period End (in percentage)     4.995% 6.90%       2.58%       5.70%           13.21%       4.56%      
Equity Method Investment Debt Of Partially Owned Entities       $ 5,206,299 $ 5,702,247     $ 1,034,289 $ 1,049,959     $ 3,646,299 $ 3,622,759         $ 195,891 $ 199,021     $ 1,703,586 $ 1,709,509    
Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities $ 4,094,370 $ 4,189,403