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Investments in Partially Owned Entities (Alexander's Inc.) (Details) - Alexander's - USD ($)
$ / shares in Units, $ in Thousands
May 28, 2026
Jun. 30, 2026
Schedule Of Equity Method Investments    
Equity method ownership percentage   32.40%
Rego Park 1 Property    
Schedule Of Equity Method Investments    
Proceeds from sale of property $ 235,500  
Net gain on sale 44,329  
Proceeds from commissions received 2,355  
Sales commissions and fees $ 500  
Equity Method Investee    
Schedule Of Equity Method Investments    
Ownership common shares, investee (in shares)   1,654,068
Equity method ownership percentage   32.40%
Closing share price (in dollars per share)   $ 275.56
Equity method investment fair value   $ 455,795
Excess of investee's fair value over carrying amount   374,802
Excess of investee's carrying amount over equity in net assets   $ 25,221