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Summary of Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 40,337 | $ 26,501 | $ 29,636
Property management services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 14,415 | 14,444 | 14,744
Timing of satisfaction of performance obligations |  | Over time |  |
Asset management services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 6,921 | 6,963 | 7,135
Timing of satisfaction of performance obligations |  | Over time |  |
Promote income [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees | [1] | $ 13,589 |  |
Timing of satisfaction of performance obligations |  | Over time |  |
Leasing services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 4,096 | 3,150 | 3,692
Timing of satisfaction of performance obligations |  | Point in time |  |
Other transaction fees [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 1,316 | $ 1,944 | $ 4,065
Timing of satisfaction of performance obligations |  | Point in time |  |
[1] | The Company recognized $13.6 million in promote revenue during the year ended December 31, 2021, for exceeding partnership return thresholds from the Company's performance as managing member in the USAA partnership. The consideration was paid in the form of a real estate asset.

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