INVESTMENTS - Schedule of Investments Held and Securities Sold Short by Consolidated Funds (Details) - Consolidated Funds - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 2,683,708	$ 3,322,558
Debt securities, fair value as a percentage of investments of consolidated funds	54.30%	64.80%
Equity securities, fair value	$ 2,056,973	$ 1,645,766
Equity securities, fair value as a percentage of investments of consolidated funds	41.50%	31.80%
Real estate investments, at fair value	$ 206,181	$ 175,353
Real estate, fair value as a percentage of investments of consolidated funds	4.20%	3.40%
Investments, at fair value	$ 4,946,862	$ 5,143,677
Total investments, fair value as a percentage of investments of consolidated funds	100.00%	100.00%
Health care
Schedule Of Investments In Marketable Securities [Line Items]
Equity securities, fair value as a percentage of investments of consolidated funds	0.00%
United States:
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 1,857,874	$ 2,328,442
Debt securities, fair value as a percentage of investments of consolidated funds	37.60%	45.40%
Total debt securities, cost	$ 1,792,830	$ 2,341,421
Equity securities, fair value	$ 1,610,427	$ 1,281,750
Equity securities, fair value as a percentage of investments of consolidated funds	32.60%	24.80%
Total equity securities, cost	$ 1,362,953	$ 1,095,721
Real estate investments, at fair value	$ 15,036	$ 13,780
Real estate, fair value as a percentage of investments of consolidated funds	0.30%	0.30%
Real estate securities, cost	$ 26,966	$ 22,716
United States: | Communication services
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 171,325	$ 69,509
Debt securities, fair value as a percentage of investments of consolidated funds	3.60%	1.40%
Equity securities, fair value	$ 59,897	$ 79,522
Equity securities, fair value as a percentage of investments of consolidated funds	1.20%	1.50%
United States: | Consumer discretionary
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 134,403	$ 202,355
Debt securities, fair value as a percentage of investments of consolidated funds	2.70%	3.90%
Equity securities, fair value	$ 37,185	$ 68,056
Equity securities, fair value as a percentage of investments of consolidated funds	0.80%	1.30%
United States: | Consumer staples
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 40,195	$ 28,149
Debt securities, fair value as a percentage of investments of consolidated funds	0.80%	0.50%
United States: | Energy
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 34,498	$ 110,990
Debt securities, fair value as a percentage of investments of consolidated funds	0.70%	2.20%
Equity securities, fair value	$ 503,018	$ 427,034
Equity securities, fair value as a percentage of investments of consolidated funds	10.20%	8.30%
United States: | Financials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 133,904	$ 223,794
Debt securities, fair value as a percentage of investments of consolidated funds	2.70%	4.40%
Equity securities, fair value	$ 347,839	$ 171,924
Equity securities, fair value as a percentage of investments of consolidated funds	7.00%	3.30%
United States: | Health care
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 182,525	$ 226,554
Debt securities, fair value as a percentage of investments of consolidated funds	3.70%	4.40%
Equity securities, fair value	$ 57,337	$ 32,418
Equity securities, fair value as a percentage of investments of consolidated funds	1.20%	0.60%
United States: | Industrials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 180,469	$ 379,538
Debt securities, fair value as a percentage of investments of consolidated funds	3.60%	7.50%
Equity securities, fair value	$ 532,096	$ 369,019
Equity securities, fair value as a percentage of investments of consolidated funds	10.80%	7.20%
United States: | Information technology
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 45,702	$ 87,355
Debt securities, fair value as a percentage of investments of consolidated funds	0.90%	1.70%
Equity securities, fair value	$ 55,413	$ 44,350
Equity securities, fair value as a percentage of investments of consolidated funds	1.10%	0.90%
United States: | Materials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 32,448	$ 333,459
Debt securities, fair value as a percentage of investments of consolidated funds	0.70%	6.50%
United States: | Real estate
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 54,475	$ 97,621
Debt securities, fair value as a percentage of investments of consolidated funds	1.10%	1.90%
Equity securities, fair value	$ 10,275	$ 0
Equity securities, fair value as a percentage of investments of consolidated funds	0.20%	0.00%
Real estate investments, at fair value	$ 15,036	$ 13,780
Real estate, fair value as a percentage of investments of consolidated funds	0.30%	0.30%
United States: | Utilities
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 19,707	$ 19,954
Debt securities, fair value as a percentage of investments of consolidated funds	0.40%	0.40%
Equity securities, fair value	$ 7,367	$ 89,427
Equity securities, fair value as a percentage of investments of consolidated funds	0.10%	1.70%
United States: | Other
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 828,223	$ 549,164
Debt securities, fair value as a percentage of investments of consolidated funds	16.70%	10.60%
Europe:
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 160,989	$ 253,676
Debt securities, fair value as a percentage of investments of consolidated funds	3.30%	4.90%
Total debt securities, cost	$ 161,153	$ 231,315
Equity securities, fair value	$ 375,486	$ 264,564
Equity securities, fair value as a percentage of investments of consolidated funds	7.60%	5.10%
Total equity securities, cost	$ 295,630	$ 208,130
Real estate investments, at fair value	$ 191,145	$ 161,573
Real estate, fair value as a percentage of investments of consolidated funds	3.80%	3.10%
Real estate securities, cost	$ 191,470	$ 159,423
Europe: | Communication services
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 7,018	$ 111,898
Debt securities, fair value as a percentage of investments of consolidated funds	0.10%	2.10%
Equity securities, fair value	$ 81,124	$ 0
Equity securities, fair value as a percentage of investments of consolidated funds	1.60%	0.00%
Europe: | Consumer discretionary
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 18,560
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.40%
Equity securities, fair value	$ 48,995	$ 52,468
Equity securities, fair value as a percentage of investments of consolidated funds	1.00%	1.00%
Real estate investments, at fair value	$ 60,960	$ 61,357
Real estate, fair value as a percentage of investments of consolidated funds	1.20%	1.20%
Europe: | Consumer staples
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 3,107
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.10%
Europe: | Energy
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 1,185
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.00%
Europe: | Financials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 18,381
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.40%
Equity securities, fair value	$ 58,329	$ 49,496
Equity securities, fair value as a percentage of investments of consolidated funds	1.20%	1.00%
Europe: | Health care
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 76,817	$ 12,136
Debt securities, fair value as a percentage of investments of consolidated funds	1.60%	0.20%
Equity securities, fair value	$ 0	$ 19
Equity securities, fair value as a percentage of investments of consolidated funds		0.00%
Europe: | Industrials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 4,316	$ 15,993
Debt securities, fair value as a percentage of investments of consolidated funds	0.10%	0.30%
Equity securities, fair value	$ 119,058	$ 93,662
Equity securities, fair value as a percentage of investments of consolidated funds	2.40%	1.70%
Europe: | Information technology
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 5,402
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.10%
Europe: | Materials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 4,335	$ 13,487
Debt securities, fair value as a percentage of investments of consolidated funds	0.10%	0.30%
Equity securities, fair value	$ 24,282	$ 24,282
Equity securities, fair value as a percentage of investments of consolidated funds	0.50%	0.50%
Europe: | Real estate
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 35,768	$ 13,424
Debt securities, fair value as a percentage of investments of consolidated funds	0.70%	0.30%
Equity securities, fair value	$ 43,698	$ 44,637
Equity securities, fair value as a percentage of investments of consolidated funds	0.90%	0.90%
Real estate investments, at fair value	$ 130,185	$ 100,216
Real estate, fair value as a percentage of investments of consolidated funds	2.60%	1.90%
Europe: | Utilities
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 5,417
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.10%
Europe: | Other
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 32,735	$ 34,686
Debt securities, fair value as a percentage of investments of consolidated funds	0.70%	0.60%
Asia and other:
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 664,845	$ 740,440
Debt securities, fair value as a percentage of investments of consolidated funds	13.40%	14.50%
Total debt securities, cost	$ 680,671	$ 761,394
Equity securities, fair value	$ 71,060	$ 99,452
Equity securities, fair value as a percentage of investments of consolidated funds	1.40%	1.90%
Total equity securities, cost	$ 55,638	$ 90,638
Asia and other: | Communication services
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 803
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.00%
Asia and other: | Consumer discretionary
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 45,686	$ 17,195
Debt securities, fair value as a percentage of investments of consolidated funds	0.90%	0.30%
Asia and other: | Consumer staples
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 18,204	$ 19,820
Debt securities, fair value as a percentage of investments of consolidated funds	0.40%	0.40%
Asia and other: | Energy
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 1,307
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.00%
Asia and other: | Financials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 8,192
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.20%
Asia and other: | Health care
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 402
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.00%
Asia and other: | Industrials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 4,181
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.10%
Equity securities, fair value	$ 30,827	$ 63,161
Equity securities, fair value as a percentage of investments of consolidated funds	0.60%	1.20%
Asia and other: | Information technology
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 5
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.00%
Asia and other: | Materials
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 243,021	$ 249,492
Debt securities, fair value as a percentage of investments of consolidated funds	4.90%	4.90%
Asia and other: | Real estate
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 357,934	$ 435,799
Debt securities, fair value as a percentage of investments of consolidated funds	7.20%	8.50%
Equity securities, fair value	$ 32,916	$ 32,916
Equity securities, fair value as a percentage of investments of consolidated funds	0.70%	0.60%
Asia and other: | Utilities
Schedule Of Investments In Marketable Securities [Line Items]
Debt securities, fair value	$ 0	$ 3,244
Debt securities, fair value as a percentage of investments of consolidated funds	0.00%	0.10%
Equity securities, fair value	$ 7,317	$ 3,375
Equity securities, fair value as a percentage of investments of consolidated funds	0.10%	0.10%