INVESTMENTS - Net Gains (Losses) from Investment Activities of Consolidated Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ (51,776)	$ 31,680
Net Change in Unrealized Appreciation (Depreciation) on Investments	117,474	(25,182)
Consolidated Funds | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(51,776)	31,680
Net Change in Unrealized Appreciation (Depreciation) on Investments	117,474	(25,182)
Consolidated Funds | Investments and other financial instruments | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(55,747)	30,259
Net Change in Unrealized Appreciation (Depreciation) on Investments	111,713	(35,958)
Consolidated Funds | CLO liabilities | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	35	0
Net Change in Unrealized Appreciation (Depreciation) on Investments	1,362	0
Consolidated Funds | Foreign-currency forward contracts | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(351)	(1,614)
Net Change in Unrealized Appreciation (Depreciation) on Investments	5,735	(3,984)
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	0	(5)
Net Change in Unrealized Appreciation (Depreciation) on Investments	633	(12)
Consolidated Funds | Options and futures | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(206)	432
Net Change in Unrealized Appreciation (Depreciation) on Investments	(388)	(398)
Consolidated Funds | Commodity swaps | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	4,493	2,608
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (1,581)	$ 15,170