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RELATED PARTIES - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 26, 2015 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |  |
Fees receivable |  | $ 531,498 |  | $ 640,567
Payable pursuant to tax receivable agreement |  | 75,826 |  | 75,899
Investment Advisor | Sponsored Funds |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue |  | 138,058 | $ 134,220 |
Fees receivable |  | 55,400 |  | 68,577
LTBP Trust |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Payable pursuant to tax receivable agreement |  | $ 75,826 |  | $ 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% |  |  |

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