INVESTMENTS - Schedule of Financial Information for the Company’s Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments
Total assets	$ 28,633,369	$ 24,884,308
Total liabilities	19,931,981	17,485,922
Total equity	8,676,092	6,824,190	$ 4,474,313	$ 3,798,618
Expenses	(4,708,766)	(2,938,691)	(2,797,858)
Income tax expense	(198,535)	(164,617)	(172,971)
Net income (loss)	834,454
Equity Method Investment, Nonconsolidated Investee
Investments
Total investments	80,769,454	65,736,013
Total assets	87,370,030	70,922,581
Total liabilities	25,019,655	18,396,247
Total equity	62,350,375	52,526,334
Interest and dividend income	4,121,467	3,583,038	3,756,681
Expenses	(1,965,938)	(2,033,810)	(2,067,667)
Net realized and unrealized gains (losses) from investments	2,321,110	1,643,477	614,489
Income tax expense	(37,169)	(42,779)	(15,963)
Net income (loss)	4,439,470	3,149,926	2,287,540
Equity Method Investment, Nonconsolidated Investee | Credit Group
Investments
Total investments	29,976,380	24,635,069
Total assets	34,026,287	27,987,915
Total liabilities	7,857,741	6,403,988
Total equity	26,168,546	21,583,927
Interest and dividend income	2,619,911	2,357,057	2,584,262
Expenses	(879,571)	(893,272)	(862,257)
Net realized and unrealized gains (losses) from investments	327,980	556,170	525,776
Income tax expense	(10,000)	(5,884)	(28,334)
Net income (loss)	2,058,320	2,014,071	2,219,447
Equity Method Investment, Nonconsolidated Investee | Real Assets Group
Investments
Total investments	36,607,529	19,966,560
Total assets	38,857,374	21,368,342
Total liabilities	14,995,035	7,535,764
Total equity	23,862,339	13,832,578
Interest and dividend income	1,386,146	1,018,717	1,036,710
Expenses	(806,547)	(564,678)	(632,433)
Net realized and unrealized gains (losses) from investments	787,161	382,681	(599,200)
Income tax expense	(26,417)	(9,341)	(10,197)
Net income (loss)	1,340,343	827,379	(205,120)
Equity Method Investment, Nonconsolidated Investee | Private Equity Group
Investments
Total investments	6,070,640	5,906,807
Total assets	6,170,635	5,897,152
Total liabilities	189,556	151,502
Total equity	5,981,079	5,745,650
Interest and dividend income	114,025	196,756	133,749
Expenses	(80,679)	(67,667)	(88,841)
Net realized and unrealized gains (losses) from investments	680,687	496,096	322,165
Income tax expense	(752)	(27,554)	22,587
Net income (loss)	713,281	597,631	389,660
Equity Method Investment, Nonconsolidated Investee | Secondaries Group
Investments
Total investments	8,018,942	15,191,773
Total assets	8,216,784	15,632,653
Total liabilities	1,976,349	4,304,893
Total equity	6,240,435	11,327,760
Interest and dividend income	1,385	10,508	1,960
Expenses	(195,787)	(507,192)	(482,478)
Net realized and unrealized gains (losses) from investments	533,124	208,947	373,064
Income tax expense	0	0	0
Net income (loss)	338,722	(287,737)	(107,454)
Equity Method Investment, Nonconsolidated Investee | Other
Investments
Total investments	95,963	35,804
Total assets	98,950	36,519
Total liabilities	974	100
Total equity	97,976	36,419
Interest and dividend income	0	0	0
Expenses	(3,354)	(1,001)	(1,658)
Net realized and unrealized gains (losses) from investments	(7,842)	(417)	(7,316)
Income tax expense	0	0	(19)
Net income (loss)	$ (11,196)	$ (1,418)	$ (8,993)