Summary of Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Product Information [Line Items]
Management, transaction, and other fees		$ 26,954	$ 25,851	$ 40,337
Property management services [Member]
Product Information [Line Items]
Management, transaction, and other fees		$ 14,075	13,470	14,415
Timing of satisfaction of performance obligations		Over time
Asset management services [Member]
Product Information [Line Items]
Management, transaction, and other fees		$ 6,542	6,752	6,921
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		$ 3,908	3,945	4,096
Timing of satisfaction of performance obligations		Point in time
Other transaction fees [Member]
Product Information [Line Items]
Management, transaction, and other fees		$ 2,429	$ 1,684	$ 1,316
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 hurdles from the Company's performance as managing member in the USAA partnership. The consideration was paid in the form of a real estate asset.