FAIR VALUE - Schedule of Changes in Fair Value of Level III Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net change in unrealized appreciation (depreciation) on consolidated funds’ investments	Net change in unrealized appreciation (depreciation) on consolidated funds’ investments
Consolidated Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,603,942	$ 2,390,273
Deconsolidation of funds	(70,234)
Transfers into Level III	764,645	325,894
Transfers out of Level III	(544,179)	(250,877)
Purchases	1,333,090	1,599,156
Sales	(1,059,757)	(478,871)
Realized gain (losses), net	19,523	27,841
Unrealized appreciation (depreciation), net	15,953	(9,474)
Ending balance	4,062,983	3,603,942
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	50,875	(22,513)
Consolidated Funds | Corporate Debt – Bank Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,721,888	702,497
Deconsolidation of funds	(67,293)
Transfers into Level III	560,765	192,202
Transfers out of Level III	(337,454)	(184,854)
Purchases	770,814	1,234,175
Sales	(649,253)	(262,336)
Realized gain (losses), net	8,926	(22)
Unrealized appreciation (depreciation), net	(72,078)	40,226
Ending balance	1,936,315	1,721,888
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(16,125)	28,278
Consolidated Funds | Corporate Debt – All Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	260,292	219,503
Deconsolidation of funds	(10)
Transfers into Level III	41,610	13,236
Transfers out of Level III	(150,382)	(15,170)
Purchases	60,292	103,654
Sales	(79,377)	(76,295)
Realized gain (losses), net	1,482	(639)
Unrealized appreciation (depreciation), net	(22,355)	16,003
Ending balance	111,552	260,292
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(18,379)	14,951
Consolidated Funds | Equities – Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	846,773	777,198
Deconsolidation of funds	(575)
Transfers into Level III	138,379	52,730
Transfers out of Level III	(27,724)	(50,853)
Purchases	314,181	101,028
Sales	(176,382)	(55,069)
Realized gain (losses), net	66,323	22,040
Unrealized appreciation (depreciation), net	26,048	(301)
Ending balance	1,187,023	846,773
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	5,993	(342)
Consolidated Funds | Equities – Preferred Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	599,636	616,604
Deconsolidation of funds	(2,356)
Transfers into Level III	153	0
Transfers out of Level III	0	0
Purchases	129,829	125,684
Sales	(154,745)	(85,171)
Realized gain (losses), net	(57,208)	6,475
Unrealized appreciation (depreciation), net	90,832	(63,956)
Ending balance	606,141	599,636
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	85,880	(63,956)
Consolidated Funds | Real Estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	175,353	74,471
Deconsolidation of funds	0
Transfers into Level III	23,738	67,726
Transfers out of Level III	(28,619)	0
Purchases	42,203	34,615
Sales	0	0
Realized gain (losses), net	0	(13)
Unrealized appreciation (depreciation), net	(6,494)	(1,446)
Ending balance	206,181	175,353
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	(6,494)	(1,444)
Consolidated Funds | Swaps
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Deconsolidation of funds	0
Transfers into Level III	0	0
Transfers out of Level III	0	0
Purchases	15,771	0
Sales	0	0
Realized gain (losses), net	0	0
Unrealized appreciation (depreciation), net	0	0
Ending balance	15,771	0
Net change in unrealized appreciation (depreciation) attributable to assets still held at end of period	$ 0	$ 0