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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Notes payable $ 969,673 $ 965,826
Mortgages    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Mortgage payable gross 974,836 974,836
Deferred debt issuance costs, net of accumulated amortization of $13,074 and $9,212, respectively (5,163) (9,010)
Notes payable 969,673 965,826
Deferred debt issuance costs, accumulated amortization $ 13,074 9,212
Mortgages | Paramus    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Maturity date Oct. 01, 2021  
Interest rate (in percentage) 4.72%  
Mortgage payable gross $ 68,000 68,000
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. 01, 2022  
Interest rate (in percentage) 3.47%  
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. 01, 2024  
Interest rate (in percentage) 2.93%  
Mortgage payable gross $ 500,000 500,000
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. 01, 2025  
Interest rate (in percentage) 3.39%  
Mortgage payable gross $ 56,836 $ 56,836