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Business Combinations - Merger with NSAM and NRF (Narrative) (Details)				12 Months Ended
	Jan. 10, 2017	Jan. 10, 2017	Apr. 02, 2015	Dec. 31, 2018
Business Acquisition [Line Items]
Common stock, conversion ratio			1
Colony NorthStar | Class A Common Stock
Business Acquisition [Line Items]
Business combination, stock exchange, conversion ratio	1.4663	1.4663		1.4663
Colony NorthStar | Preferred stock
Business Acquisition [Line Items]
Business combination, stock exchange, conversion ratio	1
Colony NorthStar | OP Units
Business Acquisition [Line Items]
Business combination, stock exchange, conversion ratio	1.4663
NSAM | Colony NorthStar
Business Acquisition [Line Items]
Ownership interest acquired	32.85%	32.85%
NSAM | Colony NorthStar | Class A Common Stock
Business Acquisition [Line Items]
Common stock, conversion ratio	1
Business combination, stock exchange, conversion ratio	1.4663
Colony | Colony NorthStar
Business Acquisition [Line Items]
Ownership interest acquired	33.25%	33.25%
Colony | Colony NorthStar | Class A Common Stock
Business Acquisition [Line Items]
Business combination, stock exchange, conversion ratio	1.4663
NRF | Colony NorthStar
Business Acquisition [Line Items]
Ownership interest acquired	33.90%	33.90%
NRF | Colony NorthStar | Class A Common Stock
Business Acquisition [Line Items]
Business combination, stock exchange, conversion ratio	1.0996

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Business Combination, Stock Exchange, Conversion Ratio

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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