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Business Combinations - Merger Consideration (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 10, 2017 USD ($) $ / shares shares | Jan. 10, 2017 USD ($) $ / shares | Dec. 31, 2018 | Dec. 31, 2017 USD ($) | Dec. 29, 2017
Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Capitalization rate | 4.40% |  |  |  |
Minimum | Investment management contracts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Management agreement, discount rate | 8.00% |  |  |  |
Weighted average useful life | 2 years |  |  |  |
Minimum | Vehicles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 20 years |  |  |  |
Minimum | Trade name |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 20 years |  |  |  |
Management agreement, royalty rate | 1.50% |  |  |  |
Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Capitalization rate | 12.50% |  |  |  |
Maximum | Investment management contracts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Management agreement, discount rate | 10.00% |  |  |  |
Weighted average useful life | 18 years |  |  |  |
Maximum | Vehicles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 30 years |  |  |  |
Maximum | Trade name |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 30 years |  |  |  |
Management agreement, royalty rate | 2.00% |  |  |  |
Colony NorthStar | Minimum | Ground lease obligations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 6 years |  |  |  |
Colony NorthStar | Minimum | Other real estate related intangibles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 1 year |  |  |  |
Colony NorthStar | Maximum | Ground lease obligations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 90 years |  |  |  |
Colony NorthStar | Maximum | Other real estate related intangibles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life | 17 years |  |  |  |
NSAM and NRF |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash assumed | $ 437,400 | $ 437,400 |  | $ 260,609 |
Management agreement, off-market component, value | $ 1,500,000 | $ 1,500,000 |  | 1,514,085 |
NSAM |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, stock exchange, conversion ratio | 1.4663 |  |  |  |
Cash assumed |  |  |  | 152,858 |
Management agreement, off-market component, value |  |  |  | $ 0 |
Management agreement, discount rate | 10.00% |  |  |  |
NSAM | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership interest acquired | 32.85% | 32.85% |  |  |
Colony Capital, Inc. | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Dividend payable assumed in merger | $ 226,100 | $ 226,100 |  |  |
Payroll tax liability assumed in merger | $ 78,900 | $ 78,900 |  |  |
Class A Common Stock | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, stock exchange, conversion ratio | 1.4663 | 1.4663 | 1.4663 |  |
Class A Common Stock | Colony Capital Operating Company, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 21.52 | $ 21.52 |  |  |
Class A Common Stock | NSAM | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, stock exchange, conversion ratio | 1.4663 |  |  |  |
Class A Common Stock | NorthStar Realty Finance Corp. | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, stock exchange, conversion ratio | 1.3335 |  |  |  |
Preferred stock | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, stock exchange, conversion ratio | 1 |  |  |  |
Preferred stock | Colony Capital, Inc. | Colony NorthStar |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares issued for each share held by acquiree | shares | 1 |  |  |  |
Townsend | NSAM |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership interest acquired | 84.00% | 84.00% |  |  | 84.00%

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