INVESTMENTS - Schedule of Investments of the Consolidated Funds (Details) - Consolidated Funds  - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investments
Total investments, at fair value	$ 14,319,917	$ 14,601,587
Fixed income investments:
Investments
Total investments, at fair value	$ 11,191,112	$ 11,718,445
Percentage of total investments	78.20%	80.30%
Fixed income investments: | Loans and securitization vehicles
Investments
Total investments, at fair value	$ 10,147,424	$ 10,616,458
Percentage of total investments	70.90%	72.70%
Fixed income investments: | Money market funds and U.S. treasury securities
Investments
Total investments, at fair value	$ 529,887	$ 523,038
Percentage of total investments	3.70%	3.60%
Fixed income investments: | Bonds
Investments
Total investments, at fair value	$ 513,801	$ 578,949
Percentage of total investments	3.60%	4.00%
Partnership interests
Investments
Total investments, at fair value	$ 1,721,331	$ 1,642,489
Percentage of total investments	12.00%	11.20%
Equity securities
Investments
Total investments, at fair value	$ 1,407,474	$ 1,240,653
Percentage of total investments	9.80%	8.50%