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Mortgages Payable - Summary of Outstanding Mortgages Payable (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Notes payable $ 1,162,928 $ 1,240,222
Mortgages    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Mortgage payable gross 1,171,226 1,252,440
Deferred debt issuance costs, net of accumulated amortization of $10,219 and $6,315, respectively (8,298) (12,218)
Notes payable $ 1,162,928 1,240,222
Mortgages | Paramus    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Maturity date Oct. 05, 2018  
Interest rate (in percentage) 2.90%  
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 Nov. 30, 2018  
Interest rate (in percentage) 4.11%  
Mortgage payable gross $ 253,226 256,194
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) 3.51%  
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) 3.06%  
Mortgage payable gross $ 500,000 500,000
Mortgages | Rego Park I | Retail Space    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest rate (in percentage) 0.00%  
Mortgage payable gross $ 0 $ 78,246