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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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- Definition 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 + Details
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