INVESTMENTS - Schedule of Net Gains (Losses) from Investment Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ 70,047	$ 560	$ 46,052	$ 75,137
Net Change in Unrealized Appreciation (Depreciation) on Investments	38,837	(12,495)	120,314	(140,344)
Consolidated Funds \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	70,047	560	46,052	75,137
Net Change in Unrealized Appreciation (Depreciation) on Investments	38,837	(12,495)	120,314	(140,344)
Consolidated Funds \| Investments and other financial instruments \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	71,021	2,804	45,115	71,314
Net Change in Unrealized Appreciation (Depreciation) on Investments	38,592	23,246	100,476	(77,968)
Consolidated Funds \| Foreign-currency forward contracts \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(1,185)	(1,103)	(514)	4,352
Net Change in Unrealized Appreciation (Depreciation) on Investments	(1,471)	(39,021)	19,246	(64,492)
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	(88)	0	365	(627)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(60)	(69)	(1,353)	647
Consolidated Funds \| Options and futures \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	402	(1,141)	1,189	98
Net Change in Unrealized Appreciation (Depreciation) on Investments	2,282	3,349	2,451	1,469
Consolidated Funds \| Commodity swaps \| Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(103)	0	(103)	0
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (506)	$ 0	$ (506)	$ 0