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, 2020	Mar. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Recurring fees		$ 74,687	$ 62,117
Transactional fees		19,960	11,348
Promote revenue		591	0
Total strategic capital revenues from unconsolidated co-investment ventures	[1]	$ 95,238	$ 73,465

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