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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Notes payable $ 1,157,263 $ 1,156,170
Mortgages    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Mortgage payable gross 1,164,544 1,164,544
Deferred debt issuance costs, net of accumulated amortization of $14,172 and $13,034, respectively (7,281) (8,374)
Notes payable 1,157,263 1,156,170
Deferred debt issuance costs, accumulated amortization $ 14,172 13,034
Mortgages | Paramus    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Maturity date Oct. 04, 2021  
Interest rate (in percentage) 4.72%  
Mortgage payable gross $ 68,000 68,000
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) 0.98%  
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) 1.43%  
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