INVESTMENTS - Net Gains (Losses) from Investment Activities of Consolidated Funds (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ 30,701	$ 16,126	$ 62,381	$ (73,099)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(12,789)	(155,352)	(37,971)	(26,993)
Consolidated Funds | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	30,701	16,126	62,381	(73,099)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(12,789)	(155,352)	(37,971)	(26,993)
Consolidated Funds | Investments and other financial instruments | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	27,208	21,673	57,467	(68,382)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(5,980)	(124,313)	(41,938)	76,954
Consolidated Funds | CLO liabilities | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	(12,319)	0	(14,434)
Net Change in Unrealized Appreciation (Depreciation) on Investments	0	(40,956)	0	(86,800)
Consolidated Funds | Foreign-currency forward contracts | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	93	14,133	(1,521)	15,089
Net Change in Unrealized Appreciation (Depreciation) on Investments	(6,596)	9,494	(10,580)	12,422
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	122	4,266	117	282
Net Change in Unrealized Appreciation (Depreciation) on Investments	468	32,939	456	106
Consolidated Funds | Options and futures | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	640	4,108	1,072	10,081
Net Change in Unrealized Appreciation (Depreciation) on Investments	1,134	(2,088)	736	(105)
Consolidated Funds | Commodity swaps | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	2,638	(15,735)	5,246	(15,735)
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (1,815)	$ (30,428)	$ 13,355	$ (29,570)