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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

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