Unconsolidated Entities - Summary of Strategic Capital Revenues Recognized in Consolidated Statements of Income Related to Co-Investment Ventures (Detail) - Unconsolidated Co-Investment Ventures [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Recurring fees		$ 91,037	$ 74,687
Transactional fees		20,878	19,960
Promote revenue		1,615	591
Total strategic capital revenues from unconsolidated co-investment ventures	[1]	$ 113,530	$ 95,238

[1] These amounts exclude strategic capital revenues from other ventures