RELATED PARTIES - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Oct. 26, 2015	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Fees receivable		$ 459,703		$ 560,552
Benefit pursuant to tax receivable agreement		0	$ 40,435
Payable pursuant to tax receivable agreement		115,001		115,087
Investment Advisor | Sponsored Funds
Related Party Transaction [Line Items]
Revenue		134,220	133,523
Fees receivable		56,134		67,598
LTBP Trust
Related Party Transaction [Line Items]
Benefit pursuant to tax receivable agreement			$ (40,435)
Payable pursuant to tax receivable agreement		$ 115,001		$ 115,087
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%