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Equity Investments - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Impairment loss   $ 588,223,000 $ 420,360,000 $ 11,717,000  
Impairment loss   588,223,000 104,360,000 11,717,000  
Equity method investments $ 2,290,095,000 2,290,095,000 1,527,054,000    
Colony Starwood Homes          
Schedule of Equity Method Investments [Line Items]          
Proceeds from share issuance     500,500,000    
Gain in earnings of investments in unconsolidated ventures     191,200,000    
NorthStar RXR NY Metro          
Schedule of Equity Method Investments [Line Items]          
Stock redeemed price paid per share (in dollars per share) $ 0.01        
Noncontrolling interest, write off $ 1,500,000        
ADC investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 481,477,000 481,477,000 331,268,000    
Lending commitments   47,800,000      
Company Sponsored Funds          
Schedule of Equity Method Investments [Line Items]          
Unfunded lending commitment $ 288,300,000 $ 288,300,000      
Discontinued Operations, Disposed of by Means Other than Sale | CLNY Contributed Portfolio          
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated ventures         $ 208,738,000
Colony Credit          
Schedule of Equity Method Investments [Line Items]          
Net asset value per share (in dollars per share) $ 21.65 $ 21.65      
Class A Common Stock | Common Stock | Colony Credit          
Schedule of Equity Method Investments [Line Items]          
Share price (in dollars per share) $ 15.79 $ 15.79      
Investment ventures          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, impairment   $ 0      
Investment ventures | Nonrecurring          
Schedule of Equity Method Investments [Line Items]          
Assets, fair value $ 61,182,000 $ 61,182,000 $ 6,774,000 $ 0  
Albertsons/Safeway          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage by co-investment partner 50.00% 50.00%      
Minimum | Class A Common Stock | Common Stock | Colony Credit          
Schedule of Equity Method Investments [Line Items]          
Share price (in dollars per share) $ 15.56 $ 15.56      
Maximum | Class A Common Stock | Common Stock | Colony Credit          
Schedule of Equity Method Investments [Line Items]          
Share price (in dollars per share) $ 23.23 $ 23.23