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Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]            
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate     $ 8,471,000 $ 0 $ (4,158,000) $ 0
55 West 46th Street, Tower 46 | Joint venture            
Schedule of Equity Method Investments [Line Items]            
Ownership interest 20.00% 25.00% 20.00%   20.00%  
Gross Asset Valuation $ 858,100,000 $ 275,000.0 $ 858,100,000   $ 858,100,000  
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate 8,900 $ (15,200)        
Disposition Of Joint Venture Interests Or Properties In 2021 | Joint venture            
Schedule of Equity Method Investments [Line Items]            
Employee-related liabilities $ 1,400,000   $ 1,400,000   $ 1,400,000