Related Parties - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 26, 2015	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Fees receivable		$ 571,127		$ 571,127		$ 669,464
Payments under tax receivable agreement				21,035	$ 10,215
LTBP Trust [Member]
Related Party Transaction [Line Items]
Amount of cash savings in income or franchise tax that would be realized as a result of increases in tax basis and certain other tax benefits related to the amended and restated tax receivable agreement	45.00%
Cash tax saving that may arise from tax basis increases attributable to payments under the amended and restated tax receivable agreement	85.00%
Cumulative liability relating to obligations under Amended and Restated Tax Receivable Agreement		192,399		192,399		213,434
Payments under tax receivable agreement				$ 21,035
Amended and Restated Tax Receivable Agreement [Member]
Related Party Transaction [Line Items]
Tax agreement termination year				2033
Sponsored Funds [Member]
Related Party Transaction [Line Items]
Revenue		$ 159,749	$ 164,340	$ 458,462	$ 524,464
Type of Revenue [Extensible List]		Asset Management Fees [Member]	Asset Management Fees [Member]	Asset Management Fees [Member]	Asset Management Fees [Member]
Fees receivable		$ 56,527		$ 56,527		$ 96,740