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Fair Value - Fair Value of Assets and Liabilities (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Jul. 01, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity method investments |  | $ 81,085,000 | $ 363,901,000 |
Debt securities, at fair value |  | 96,833,000 | 348,342,000 |
Fair Value |  |  | 323,243,000 |
Other assets—derivative assets |  | 33,558,000 | 10,152,000 |
Other liabilities—derivative liabilities |  | 132,808,000 | 204,848,000 |
Contingent consideration—THL Hotel Portfolio (Note 3) |  | 8,903,000 | 7,419,000 |
Due to affiliates—contingent consideration for Internalization |  | 0 | 23,534,000 |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity method investments |  | 0 | 0 |
Other assets—derivative assets |  | 0 | 0 |
Other liabilities—derivative liabilities |  | 0 | 0 |
Contingent consideration—THL Hotel Portfolio (Note 3) |  | 0 | 0 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity method investments |  | 0 | 0 |
Other assets—derivative assets |  | 33,558,000 | 10,152,000 |
Other liabilities—derivative liabilities |  | 132,808,000 | 204,848,000 |
Contingent consideration—THL Hotel Portfolio (Note 3) |  | 0 | 0 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity method investments |  | 81,085,000 | 363,901,000 |
Other assets—derivative assets |  | 0 | 0 |
Other liabilities—derivative liabilities |  | 0 | 0 |
Contingent consideration—THL Hotel Portfolio (Note 3) |  | 8,903,000 | 7,419,000 |
CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 32,706,000 | 25,099,000 |
Fair Value |  |  | 147,945,000 |
CMBS | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 0 | 0 |
Fair Value |  |  | 0 |
CMBS | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 32,706,000 | 25,099,000 |
Fair Value |  |  | 0 |
CMBS | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 0 | 0 |
Fair Value |  |  | 147,945,000 |
Other securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 66,983,000 |
Other securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Other securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Other securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 66,983,000 |
N-Star CDO bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  | 64,127,000 | 90,933,000 |
N-Star CDO bonds | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  | 0 | 0 |
N-Star CDO bonds | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  | 0 | 0 |
N-Star CDO bonds | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  | 64,127,000 | 90,933,000 |
CMBS and other securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 17,382,000 |
CMBS and other securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
CMBS and other securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
CMBS and other securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 17,382,000 |
Equity securities of consolidated fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 26,754,000 | 35,600,000 |
Equity securities of consolidated fund | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  |  | 35,600,000 |
Equity securities of consolidated fund | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | 0 | 0 |
Equity securities of consolidated fund | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, at fair value |  | $ 0 | 0 |
Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Due to affiliates—contingent consideration for Internalization |  |  | 20,650,000 |
Contingent consideration | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Due to affiliates—contingent consideration for Internalization |  |  | 0 |
Contingent consideration | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Due to affiliates—contingent consideration for Internalization |  |  | 0 |
Colony NorthStar | Class A Common Stock | Affiliated Entity | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of shares contingent upon achievement of performance targets (shares) | shares |  | 1,290,000 |  |
Colony NorthStar | Class B Common Stock | Affiliated Entity | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of shares contingent upon achievement of performance targets (shares) | shares |  | 115,226 |  |
Colony NorthStar | OP Units | Affiliated Entity | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of shares contingent upon achievement of performance targets (shares) | shares |  | 4,400,000 |  |
Maximum | THL Hotel Portfolio |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration—THL Hotel Portfolio (Note 3) |  |  |  | $ 13,000,000.0
Loans receivable—securitized loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  |  | 45,423,000 |
Loans receivable—securitized loans | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  |  | 0 |
Loans receivable—securitized loans | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  |  | 0 |
Loans receivable—securitized loans | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  |  | 45,423,000 |
Securitization bonds payable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt—securitization bonds payable |  |  | 44,542,000 |
Securitization bonds payable | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt—securitization bonds payable |  |  | 0 |
Securitization bonds payable | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt—securitization bonds payable |  |  | 0 |
Securitization bonds payable | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt—securitization bonds payable |  |  | 44,542,000 |
Discounted cash flows | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration—THL Hotel Portfolio (Note 3) |  |  | 7,419,000 |
Discounted cash flows | N-Star CDO bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  | $ 64,127,000 | 90,933,000 |
Discounted cash flows | Private funds and other | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  | 5,908,000 | 204,774,000 |
Discounted cash flows | Other investment ventures | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  | 21,831,000 | 26,408,000 |
Multiple | Other investment ventures | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  | $ 25,000,000 |  |
Measurement input |  | 5.8 |  |
Monte Carlo simulation | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Due to affiliates—contingent consideration for Internalization |  |  | 20,650,000 |
Recent Transaction Price | Other investment ventures | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure |  | $ 28,346,000 | $ 132,719,000 |
Recurring | Contingent consideration | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transfer out of liabilities into equity |  | 12,539,000 |  |
Transfers out of Level 3 |  | $ 6,381,000 |  |
Discount rate | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.200 | 0.200 |
Discount rate | N-Star CDO bonds | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.216 | 0.24 |
Discount rate | Minimum | N-Star CDO bonds | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.136 | 0.108 |
Discount rate | Maximum | N-Star CDO bonds | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.565 | 0.874 |
Discount rate | Private funds and other | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.146 |
Discount rate | Private funds and other | Minimum | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.110 |
Discount rate | Private funds and other | Maximum | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.200 |
Discount rate | Other investment ventures | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.175 | 0.142 |
Discount rate | Other investment ventures | Minimum | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.091 | 0.088 |
Discount rate | Other investment ventures | Maximum | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  | 0.184 | 0.148 |
Benchmark FFO volatility | Contingent consideration | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.118 |
Equity volatility | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.187 |
Correlation | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Measurement input |  |  | 0.800 |
Common Stock | Contingent consideration | Class A Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of additional shares to be paid (in shares) | shares | 15,000 |  |  |
Common Stock | Contingent consideration | Class B Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of additional shares to be paid (in shares) | shares | 40,000 |  |  |
Senior Management | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Due to affiliates—contingent consideration for Internalization |  | $ 0 | $ 20,650,000 |
Senior Management | Recurring | Contingent consideration | Contingent consideration | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transfers out of Level 3 | $ 6,400,000 |  |  |
Senior Management | Common Stock And OP Units | Affiliated Entity | Contingent consideration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transfer out of liabilities into equity | $ 12,500,000 |  |  |
Settlement Of Contingent Consideration | OP Units |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Units issued (in units) | shares | 1,950,000 |  |  |

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