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Investments in Partially Owned Entities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
May 27, 2016
Dec. 31, 2015
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Carrying amount of investments in partially owned entitiies $ 1,497,925   $ 1,497,925     $ 1,550,422
Our share of Net Income (Loss) 4,127 $ (325) 529 $ (8,709)    
Other liabilities 457,928   457,928     426,965
650 Madison Avenue [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Write off of below market lease liability $ 7,364   $ 12,751      
7 West 34th Street            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 53.00%   53.00%      
Carrying amount of investments in partially owned entitiies $ (41,439)   $ (41,439)     0
Deferred gain $ 43,813   $ 43,813      
Sale of ownership (percent) 47.00%   47.00%      
7 West 34th Street | Joint Venture [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage         53.00%  
Deferred gain         $ 43,813  
Alexanders Inc [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 32.40%   32.40%      
Carrying amount of investments in partially owned entitiies $ 130,485   $ 130,485     133,568
Equity in net income or earnings 6,891 5,716 20,640 16,757    
Management, leasing and development fees 1,894 1,828 5,307 5,801    
Our share of Net Income (Loss) 8,785 7,544 25,947 22,558    
India real estate ventures [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Carrying amount of investments in partially owned entitiies 44,671   44,671     48,310
Our share of Net Income (Loss) $ (917) (1,704) $ (3,537) (18,380)    
Non-cash impairment losses       14,806    
India real estate ventures [Member] | Minimum            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 4.10%   4.10%      
India real estate ventures [Member] | Maximum            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 36.50%   36.50%      
Partially owned office buildings [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Carrying amount of investments in partially owned entitiies $ 811,062   $ 811,062     909,782
Our share of Net Income (Loss) $ (9,157) (2,039) $ (35,868) (14,573)    
Urban Edge Properties [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 5.40%   5.40%      
Carrying amount of investments in partially owned entitiies $ 25,817   $ 25,817     25,351
Equity in net income or earnings 1,949 934 3,896 1,338    
Management, leasing and development fees 209 466 627 1,550    
Our share of Net Income (Loss) $ 2,158 1,400 $ 4,523 2,888    
PREIT Associates            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Equity method ownership percentage 8.00%   8.00%      
Carrying amount of investments in partially owned entitiies $ 124,300   $ 124,300     133,375
Our share of Net Income (Loss) 52 (3,481) (4,763) (3,845)    
Other equity method investments [Member]            
Equity Method Investments And Income From Equity Method Investments [Abstract]            
Carrying amount of investments in partially owned entitiies 361,590   361,590     $ 300,036
Our share of Net Income (Loss) $ 3,206 $ (2,045) $ 14,227 $ 2,643