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RELATED PARTIES - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 26, 2015 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |
Fees receivable |  | $ 554,596 |  | $ 554,596 |  | $ 560,552
Benefit pursuant to tax receivable agreement |  | 0 | $ 0 | 0 | $ 40,435 |
Payable pursuant to tax receivable agreement |  | 84,137 |  | 84,137 |  | 115,087
Investment Advisor | Sponsored Funds |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue |  | 133,630 | $ 135,847 | 267,850 | 269,370 |
Fees receivable |  | 51,345 |  | 51,345 |  | 67,598
LTBP Trust |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Benefit pursuant to tax receivable agreement |  |  |  |  | $ 40,435 |
Payable pursuant to tax receivable agreement |  | $ 84,137 |  | $ 84,137 |  | $ 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% |  |  |  |  |

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