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		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule Of Equity Method Investments [Line Items]
Recurring fees		$ 67,888	$ 58,946	$ 195,542	$ 171,508
Transactional fees		14,094	11,798	41,272	39,250
Promote revenue	[1]	148,191	0	155,474	68,218
Total strategic capital revenues from unconsolidated co-investment ventures	[2]	$ 230,173	$ 70,744	$ 392,288	$ 278,976

[1] Includes promote revenue earned from an unconsolidated co-investment venture in Europe in September 2019 and China in March 2018, respectively.

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