INVESTMENTS - Schedule of Net Gains (Losses) from Investment Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ (23,995)	$ 74,577
Net Change in Unrealized Appreciation (Depreciation) on Investments	81,477	(127,849)
Consolidated Funds \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(23,995)	74,577
Net Change in Unrealized Appreciation (Depreciation) on Investments	81,477	(127,849)
Consolidated Funds \| Investments and other financial instruments \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(25,906)	68,510
Net Change in Unrealized Appreciation (Depreciation) on Investments	61,884	(101,214)
Consolidated Funds \| Foreign-currency forward contracts \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	671	5,455
Net Change in Unrealized Appreciation (Depreciation) on Investments	20,717	(25,471)
Consolidated Funds \| Total return and interest rate swaps \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	453	(627)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(1,293)	716
Consolidated Funds \| Options and futures \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	787	1,239
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ 169	$ (1,880)