REVENUES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 753,052	$ 703,106	$ 1,506,863	$ 1,386,592
Total Management and Other Fees, Net
Disaggregation of Revenue [Line Items]
Revenues	752,950	702,127	1,500,696	1,379,301
Performance revenues
Disaggregation of Revenue [Line Items]
Revenues	102	979	6,167	7,291
Credit Platform
Disaggregation of Revenue [Line Items]
Revenues	441,899	423,604	899,749	832,544
Credit Platform \| Total Management and Other Fees, Net
Disaggregation of Revenue [Line Items]
Revenues	441,805	422,625	897,540	828,609
Credit Platform \| Direct lending
Disaggregation of Revenue [Line Items]
Revenues	328,882	314,731	666,350	613,820
Credit Platform \| Alternative credit
Disaggregation of Revenue [Line Items]
Revenues	30,942	19,318	61,312	40,503
Credit Platform \| Investment grade credit
Disaggregation of Revenue [Line Items]
Revenues	17,719	16,199	35,522	32,886
Credit Platform \| Liquid credit
Disaggregation of Revenue [Line Items]
Revenues	4,367	5,555	9,119	13,035
Credit Platform \| Other
Disaggregation of Revenue [Line Items]
Revenues	9,403	12,213	25,465	22,146
Credit Platform \| Management fees
Disaggregation of Revenue [Line Items]
Revenues	391,313	368,016	797,768	722,390
Credit Platform \| Administrative, transaction and other fees
Disaggregation of Revenue [Line Items]
Revenues	57,847	54,609	114,483	106,219
Credit Platform \| Fee offsets
Disaggregation of Revenue [Line Items]
Revenues	(7,355)	0	(14,711)	0
Credit Platform \| Performance revenues
Disaggregation of Revenue [Line Items]
Revenues	94	979	2,209	3,935
Real Assets Platform
Disaggregation of Revenue [Line Items]
Revenues	136,357	116,871	274,003	240,183
Real Assets Platform \| Total Management and Other Fees, Net
Disaggregation of Revenue [Line Items]
Revenues	136,349	116,871	270,045	236,827
Real Assets Platform \| Net lease
Disaggregation of Revenue [Line Items]
Revenues	65,648	47,514	131,027	94,350
Real Assets Platform \| Real estate credit
Disaggregation of Revenue [Line Items]
Revenues	11,957	9,687	23,899	20,068
Real Assets Platform \| Digital infrastructure
Disaggregation of Revenue [Line Items]
Revenues	35,260	48,226	70,069	100,459
Real Assets Platform \| Management fees
Disaggregation of Revenue [Line Items]
Revenues	112,865	105,427	224,995	214,877
Real Assets Platform \| Administrative, transaction and other fees
Disaggregation of Revenue [Line Items]
Revenues	27,197	11,444	52,279	21,950
Real Assets Platform \| Fee offsets
Disaggregation of Revenue [Line Items]
Revenues	(3,713)	0	(7,229)	0
Real Assets Platform \| Performance revenues
Disaggregation of Revenue [Line Items]
Revenues	8	0	3,958	3,356
GP Strategic Capital Platform
Disaggregation of Revenue [Line Items]
Revenues	174,796	162,631	333,111	313,865
GP Strategic Capital Platform \| Total Management and Other Fees, Net
Disaggregation of Revenue [Line Items]
Revenues	174,796	162,631	333,111	313,865
GP Strategic Capital Platform \| GP minority stakes
Disaggregation of Revenue [Line Items]
Revenues	162,541	154,269	312,881	302,712
GP Strategic Capital Platform \| GP debt financing
Disaggregation of Revenue [Line Items]
Revenues	4,647	5,833	9,445	8,225
GP Strategic Capital Platform \| Professional sports minority stakes
Disaggregation of Revenue [Line Items]
Revenues	1,242	941	2,407	1,584
GP Strategic Capital Platform \| Strategic Revenue-Share Purchase consideration amortization
Disaggregation of Revenue [Line Items]
Revenues	(11,043)	(11,117)	(22,087)	(22,233)
GP Strategic Capital Platform \| Management fees
Disaggregation of Revenue [Line Items]
Revenues	157,387	149,926	302,646	290,288
GP Strategic Capital Platform \| Administrative, transaction and other fees
Disaggregation of Revenue [Line Items]
Revenues	$ 17,409	$ 12,705	$ 30,465	$ 23,577