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Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2018
Jun. 30, 2018
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Aug. 31, 2018
Dec. 31, 2017
Oct. 31, 2016
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             $ 3,070,825   $ 3,070,825     $ 2,362,989  
Equity in net gain on sale of interest in unconsolidated joint venture/real estate             70,937 $ 1,030 136,522 $ 16,166      
Stonehenge Portfolio                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest                         90.00%
Preferred Equity due September 2018                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             145,007   145,007     0  
Mezzanine loan due February 2022                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             44,420   44,420     44,823  
Mezzanine loan due July 2036                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             0   0     26,716  
Mezzanine Loan and Preferred Equity, Due March 2018                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             0   0     100,000  
Mezzanine Loans And Preferred Equity                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments             $ 189,427   $ 189,427     $ 171,539  
1274 Fifth Avenue                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest           9.83%              
Gross Asset Valuation           $ 44,100              
Equity in net gain on sale of interest in unconsolidated joint venture/real estate           $ (362)              
1515 Broadway                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest           13.00%              
Gross Asset Valuation           $ 1,950,000              
Equity in net gain on sale of interest in unconsolidated joint venture/real estate           $ 0              
Stonehenge Portfolio                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest         5.00%                
Gross Asset Valuation         $ 287,000                
Equity in net gain on sale of interest in unconsolidated joint venture/real estate         $ (5,701)                
175-225 Third Street Brooklyn, New York                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest       95.00%                  
Gross Asset Valuation       $ 115,000                  
Equity in net gain on sale of interest in unconsolidated joint venture/real estate       19,483                  
Employee-related liabilities       $ 1,500                  
1745 Broadway                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest     56.87%                    
Gross Asset Valuation     $ 633,000                    
Equity in net gain on sale of interest in unconsolidated joint venture/real estate     52,038                    
Employee-related liabilities     $ 2,200                    
Jericho Plaza                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest   11.67%                      
Gross Asset Valuation   $ 117,400                      
Equity in net gain on sale of interest in unconsolidated joint venture/real estate   $ 147                      
724 Fifth Avenue                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest 49.90%                        
Gross Asset Valuation $ 365,000                        
Equity in net gain on sale of interest in unconsolidated joint venture/real estate 64,587                        
Employee-related liabilities $ 2,400                        
Mezzanine Loan                          
Schedule of Equity Method Investments [Line Items]                          
Ownership Interest                     33.33%    
Gross Asset Valuation                     $ 15,000