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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
OP Units to common stock, conversion ratio |  |  |  | 1 |  |
Marketable equity securities |  |  |  | $ 26,754 | $ 35,600 |
Carried interest and incentive compensation |  |  |  | 12,181 | 0 | $ 0
Net income attributable to noncontrolling interests in investment entities |  |  |  | $ 67,994 | 129,996 | $ 163,084
Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Lag period for recording proportionate share of income for equity method investments |  |  |  | 1 month |  |
Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Lag period for recording proportionate share of income for equity method investments |  |  |  | 3 months |  |
Building, Fee Interest | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 15 years |  |
Building, Fee Interest | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 45 years |  |
Land Improvements | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 6 years |  |
Land Improvements | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 20 years |  |
Furniture, Fixtures and Equipment | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 3 years |  |
Furniture, Fixtures and Equipment | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 20 years |  |
Furniture, Fixtures, Equipment and Capitalized Software | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 3 years |  |
Furniture, Fixtures, Equipment and Capitalized Software | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Aircraft |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 15 years |  |
Incentive fees ($5,445, $172, $0 from affiliates, respectively) | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Percent of fees allocated to employees |  |  |  | 40.00% |  |
Incentive fees ($5,445, $172, $0 from affiliates, respectively) | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Percent of fees allocated to employees |  |  |  | 50.00% |  |
Scenario, Adjustment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Marketable equity securities |  |  |  |  | $ 35,600 |
Carried interest and incentive compensation | $ 3,500 | $ 1,100 | $ 900 |  |  |
Net income attributable to noncontrolling interests in investment entities | $ 3,500 | $ 1,100 | $ 900 |  |  |

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