RELATED PARTIES - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 26, 2015	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Fees receivable		$ 613,714		$ 613,714		$ 640,567
Benefit pursuant to tax receivable agreement		20,146	$ 0	20,146	$ 0
Payable pursuant to tax receivable agreement		55,680		55,680		75,899
Investment Advisor | Sponsored Funds
Related Party Transaction [Line Items]
Revenue		171,114	$ 140,025	456,539	$ 407,875
Fees receivable		62,257		62,257		68,577
LTBP Trust
Related Party Transaction [Line Items]
Payable pursuant to tax receivable agreement		$ 55,680		$ 55,680		$ 75,899
LTBP Trust | Tax Receivable Agreement
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 (as a percent)	45.00%
Cash tax saving that may arise from tax basis increases attributable to payments under the amended and restated tax receivable agreement (as a percent)	85.00%