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Debt and Preferred Equity Investments - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2014
Mortgage Loans on Real Estate [Line Items]      
Aggregate weighted average current yield (as a percent) 8.92%    
Debt Investments Held [Abstract]      
Carrying Value $ 1,977,057 $ 2,114,041  
Mezzanine Loan with an Initial Maturity Date of March 2020      
Debt Investments Held [Abstract]      
Amount participated out 1,300    
Mezzanine Loan, with an Initial Maturity Date of June 2024      
Debt Investments Held [Abstract]      
Amount participated out 12,000    
Mezzanine Loan with an Initial Maturity Date of December 2018      
Debt Investments Held [Abstract]      
Amount participated out 14,600    
Mezzanine Loan with an Initial Maturity Date of December 2018, 2      
Debt Investments Held [Abstract]      
Amount participated out 14,100    
Mezzanine Loan with an Initial Maturity of March 2019      
Debt Investments Held [Abstract]      
Amount participated out 5,100    
Debt Investments in Mortgage Loans      
Debt Investments Held [Abstract]      
Future Funding Obligations 171,399    
Senior Financing 6,709,946    
Carrying Value 1,832,006 1,969,618  
Total fixed rate      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 3,893,189    
Carrying Value 401,221 669,968  
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of March 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 1,160,000    
Carrying Value 210,832 204,005  
Total fixed rate | Mezzanine Loan, September 2021      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 15,000    
Carrying Value 3,500 3,500  
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of April 2022      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 147,000    
Carrying Value 24,927 24,913  
Total fixed rate | Mezzanine Loan with an Initial Maturity of August 2022      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 280,000    
Carrying Value 36,069 34,600  
Total fixed rate | Mezzanine Loan, November 2023      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 83,689    
Carrying Value 12,704 12,699  
Total fixed rate | Mezzanine Loan, with an Initial Maturity Date of June 2024      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 115,000    
Carrying Value 12,939 12,932  
Total fixed rate | Mezzanine Loan, January 2025      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 95,000    
Carrying Value 30,000 30,000  
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of November 2026      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 340,000    
Carrying Value 15,000 15,000  
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of June 2027      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 1,657,500    
Carrying Value 55,250 55,250  
Total fixed rate | Real Estate Acquired in Satisfaction of Debt      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 250,464  
Total fixed rate | Mezzanine Loan Repaid In August 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 26,366  
Total fixed rate | Mortgage Loan Repaid In September 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 239  
Total fixed rate | Mortgage Loan, February 2019      
Debt Investments Held [Abstract]      
Loan acquired     $ 26,400
Discount amount     200
Total fixed rate | Junior Mortgage Participation, Related To Mortgage Loan, February 2019      
Debt Investments Held [Abstract]      
Loan acquired     5,700
Discount amount     $ 5,700
Total floating rate      
Debt Investments Held [Abstract]      
Future Funding Obligations 171,399    
Senior Financing 2,816,757    
Carrying Value 1,430,785 1,299,650  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of March 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 2,944    
Senior Financing 312,310    
Carrying Value 51,669 0  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of August 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 20,523    
Carrying Value 10,977 10,934  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of October 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 2,325    
Senior Financing 45,025    
Carrying Value 35,168 34,879  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 150,000    
Carrying Value 15,368 15,381  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 14,856 14,869  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of December 2018, 3      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 33,000    
Carrying Value 26,987 26,927  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of January 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 3,607    
Senior Financing 30,438    
Carrying Value 10,403 8,550  
Total floating rate | Mezzanine Loan with an Initial Maturity of March 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 795    
Senior Financing 0    
Carrying Value 15,150 15,148  
Total floating rate | Mezzanine Loan with an Initial Maturity of March 2019, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 38,000    
Carrying Value 21,977 21,939  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of April 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 40,000    
Carrying Value 19,972 19,982  
Total floating rate | Mezzanine Loan with an Initial Maturity Date of April 2019, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 37,891    
Carrying Value 18,380 34,947  
Total floating rate | Mezzanine Loan With An Initial Maturity Date Of April 2019, 3      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 175,000    
Carrying Value 37,404 37,250  
Total floating rate | Mezzanine Loan With An Initial Maturity Date Of April 2019, 4      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 265,000    
Carrying Value 24,928 24,830  
Total floating rate | Mortgage/Jr Mortgage Participate Loan, Maturity Date of August 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 17,186    
Senior Financing 228,516    
Carrying Value 82,517 71,832  
Total floating rate | Mortgage/Mezzanine Loan With An Initial Maturity Date Of August 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 19,999 19,940  
Total floating rate | Mezzanine Loan With An Initial Maturity Date Of August 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 65,000    
Carrying Value 14,998 14,955  
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of September 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 5,905    
Senior Financing 0    
Carrying Value 180,339 143,919  
Total floating rate | Mezzanine Loan with an Initial Maturity of October 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 350,000    
Carrying Value 34,847 34,737  
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity Date of December 2019      
Debt Investments Held [Abstract]      
Future Funding Obligations 387    
Senior Financing 0    
Carrying Value 39,338 0  
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of January 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 13,048    
Senior Financing 0    
Carrying Value 56,624 43,845  
Total floating rate | Mezzanine Loan with an Initial Maturity of January 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 812    
Senior Financing 574,120    
Carrying Value 78,841 75,834  
Total floating rate | Mortgage Loan with an Initial Maturity of February 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 13,579    
Senior Financing 0    
Carrying Value 86,058 0  
Total floating rate | Mortgage and Mezzanine Loan with an Initial Maturity Date of April 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 27,776    
Senior Financing 0    
Carrying Value 288,811 0  
Total floating rate | Mezzanine Loan with an Initial Maturity of July 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 6,095    
Senior Financing 36,786    
Carrying Value 12,141 11,259  
Total floating rate | Mezzanine Loan with an Initial Maturity of November 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 41,309    
Senior Financing 355,148    
Carrying Value 85,955 75,428  
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of December 2020      
Debt Investments Held [Abstract]      
Future Funding Obligations 35,631    
Senior Financing 0    
Carrying Value 96,185 88,989  
Total floating rate | Mortgage/Mezzanine Loan with an Initial Maturity of December 2020, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 35,236 35,152  
Total floating rate | Jr Mortgage Participation/Mezzanine Loan with an Initial Maturity of July 2021      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 60,000    
Carrying Value 15,657 15,635  
Total floating rate | Mortgage/Mezzanine Loan Repaid In February 2018, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 162,553  
Total floating rate | Mortgage/Mezzanine Loan repaid in June 2017      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 74,755  
Total floating rate | Mortgage/Mezzanine Loan Sold In May 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 23,609  
Total floating rate | Mezzanine Loan Exchanged For Property In July 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 12,174  
Total floating rate | Mezzanine Loan Repaid In July 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 37,851  
Total floating rate | Mezzanine Loan Repaid In July 2018, 2      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 14,855  
Total floating rate | Mortgage/Mezzanine Loan Repaid In August 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value 0 16,969  
Total floating rate | Mezzanine Loan Repaid In September 2018      
Debt Investments Held [Abstract]      
Future Funding Obligations 0    
Senior Financing 0    
Carrying Value $ 0 $ 59,723