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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 12, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Notes payable $ 1,118,813 $ 970,961  
Mortgages      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Mortgage payable gross 1,120,544 974,836  
Deferred debt issuance costs, net of accumulated amortization of $16,605 and $14,362, respectively (1,731) (3,875)  
Notes payable 1,118,813 970,961  
Deferred debt issuance costs, accumulated amortization $ 16,605 14,362  
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, 2020    
Interest rate (in percentage) 1.57%    
Mortgage payable gross $ 350,000 350,000  
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) 1.09%    
Mortgage payable gross $ 500,000 500,000  
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 | 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) 1.53%    
Mortgage payable gross $ 202,544 $ 56,836  
Notes payable     $ 252,544