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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Notes payable $ 1,090,740 $ 1,089,613
Mortgages    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Mortgage payable gross 1,096,544 1,096,544
Deferred debt issuance costs, net of accumulated amortization of $15,686 and $14,551, respectively (5,804) (6,931)
Notes payable 1,090,740 1,089,613
Deferred debt issuance costs, accumulated amortization $ 15,686 14,551
Mortgages | 731 Lexington Avenue | Office Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 3.72%  
Mortgage payable gross $ 500,000 500,000
Mortgages | 731 Lexington Avenue | Retail Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 1.72%  
Mortgage payable gross $ 300,000 300,000
Mortgages | 731 Lexington Avenue | Retail Space | Interest rate derivatives (included in other assets)    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 1.72%  
Mortgages | Rego Park II | Retail Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 4.47%  
Mortgage payable gross $ 202,544 202,544
Mortgages | Alexander Apartment Tower | Apartment Building    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 2.63%  
Mortgage payable gross $ 94,000 $ 94,000