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Organization and Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Schedule of management, transaction, and other fees [Line Items] |  |
Management, transaction, and other fees | $ 6,684 | $ 6,393
Property management services [Member] |  |
Schedule of management, transaction, and other fees [Line Items] |  |
Management, transaction, and other fees | $ 3,618 | 3,771
Timing of satisfaction of performance obligations | Over time |
Asset management services [Member] |  |
Schedule of management, transaction, and other fees [Line Items] |  |
Management, transaction, and other fees | $ 1,755 | 1,715
Timing of satisfaction of performance obligations | Over time |
Leasing services [Member] |  |
Schedule of management, transaction, and other fees [Line Items] |  |
Management, transaction, and other fees | $ 996 | 851
Timing of satisfaction of performance obligations | Point in time |
Other transaction fees [Member] |  |
Schedule of management, transaction, and other fees [Line Items] |  |
Management, transaction, and other fees | $ 315 | $ 56
Timing of satisfaction of performance obligations | Point in time |

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