Summary of Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Parenthetical) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Information [Line Items]
Management, transaction, and other fees		$ 40,337	$ 26,501	$ 29,636
Promote income [Member]
Product Information [Line Items]
Management, transaction, and other fees	[1]	$ 13,589

[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.