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Investments in Partially Owned Entities (Alexander's Inc.) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 04, 2021
Jun. 04, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity Method Investments And Income From Equity Method Investments          
Net gains on sale of real estate     $ 0 $ 0 $ 2,571,099
Proceeds from sales of real estate     100,024 0 324,201
Repayments of long-term debt     $ 1,584,243 1,067,564 2,718,987
Alexanders Inc          
Equity Method Investments And Income From Equity Method Investments          
Investment owned, balance, shares     1,654,068    
Equity method ownership percentage     32.40%    
Accounts receivable, related parties     $ 879 1,516  
Proceeds from sale of land held-for-investment   $ 10,000      
Net gains on sale of real estate   2,956 $ 14,576 $ 0 $ 0
Proceeds from commissions received $ 750 $ 300      
Closing share price (in dollars per share)     $ 260.30    
Equity method investment fair value     $ 430,554    
Excess of investee's fair value over carrying amount     339,149    
Excess of investee's carrying amount over equity in net assets     $ 30,081    
Paramus Property | Tenant Occupant | Alexanders Inc | IKEA          
Equity Method Investments And Income From Equity Method Investments          
Net gains on sale of real estate 11,620        
Proceeds from sales of real estate 75,000        
Repayments of long-term debt $ 68,000