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Equity Investments - Equity Method Investments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) $ 2,290,095 $ 1,527,054
Colony Credit    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 36.60%  
Equity method investments (less than for 16 individual other investments) $ 1,037,754 0
NRE    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 11.20%  
Equity method investments (less than for 16 individual other investments) $ 87,696 73,578
RXR Realty    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 27.20%  
Equity method investments (less than for 16 individual other investments) $ 95,418 105,082
Preferred equity    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) 219,913 440,704
ADC investments    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) 481,477 331,268
Private funds and other    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) 110,610 25,101
Private funds—carried interest    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) 21,730 0
Other investment ventures    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) $ 154,412 187,420
Number of equity method investments | investment 18  
Individual other investment venture    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) $ 66,000  
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Equity method investments (less than for 16 individual other investments) $ 81,085 $ 363,901
Amended And Restated NRE Management Agreement | NRE    
Schedule of Equity Method Investments [Line Items]    
Maximum stock purchase eligibility, percent 45.00%  
Shares owned in excess of threshold, threshold percent 25.00%