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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Notes payable $ 1,089,990 $ 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 $14,928 and $14,551, respectively (6,554) (6,931)
Notes payable 1,089,990 1,089,613
Deferred debt issuance costs, accumulated amortization $ 14,928 14,551
Mortgages | 731 Lexington Avenue | Office Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Maturity date Jun. 11, 2024  
Interest rate (in percentage) 1.30%  
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]    
Maturity date Aug. 05, 2025  
Interest rate (in percentage) 1.72%  
Mortgage payable gross $ 300,000 300,000
Mortgages | Rego Park II | Retail Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Maturity date Dec. 12, 2025  
Interest rate (in percentage) 1.80%  
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]    
Maturity date Nov. 01, 2027  
Interest rate (in percentage) 2.63%  
Mortgage payable gross $ 94,000 $ 94,000