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Mortgages Payable - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 14, 2020
Feb. 14, 2020
Sep. 30, 2020
Sep. 30, 2019
Oct. 23, 2020
Sep. 13, 2020
Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Repayments of long-term debt     $ 50,000 $ 0      
Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Mortgage payable gross     1,070,544       $ 974,836
Rego Park II | Retail Space | Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Loan participation balance   $ 50,000          
Proceeds from notes payable   $ 145,000          
Mortgage payable gross     $ 202,544       56,836
Interest rate (in percentage)     1.50%        
Maturity date     Dec. 12, 2025        
Debt instrument, description of variable rate basis     LIBOR        
Rego Park II | Retail Space | Mortgages | LIBOR              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Basis spread over LIBOR     1.35%        
731 Lexington Avenue | Retail Space              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Repayments of long-term debt $ 50,000            
731 Lexington Avenue | Retail Space | Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Mortgage payable gross $ 300,000   $ 300,000     $ 350,000 350,000
Basis spread over LIBOR 1.40%            
Interest rate (in percentage)     1.56%        
Maturity date     Aug. 05, 2025        
Debt instrument, description of variable rate basis     LIBOR        
731 Lexington Avenue | Retail Space | Mortgages | LIBOR              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Basis spread over LIBOR     1.40%        
731 Lexington Avenue | Office Space | Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Mortgage payable gross     $ 500,000       500,000
Interest rate (in percentage)     1.05%        
Maturity date     Jun. 11, 2024        
Debt instrument, description of variable rate basis     LIBOR        
731 Lexington Avenue | Office Space | Mortgages | LIBOR              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Basis spread over LIBOR     0.90%        
Participation Agreement | Rego Park II | Retail Space | Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Loan participation balance     $ 50,000       $ 195,708
Subsequent Event | The Alexander | Apartment Building | Mortgages              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Mortgage payable gross         $ 94,000    
Interest rate (in percentage)         2.63%