SEGMENT REPORTING (Reconciliation of Income Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Economic net income
Income before taxes	$ 159,641	$ 103,576	$ 104,325	$ 323,919
Adjustments:
Equity compensation expense	30,336	22,393	91,576	73,974
Non-cash unrealized guarantee expense	9,500		9,500
Consolidated Funds
Adjustments:
(Income) loss before taxes of non-controlling interests in Consolidated Funds, net of eliminations	42,627	15,908	(38,593)	41,878
Total investment income - realized	(116,581)	(107,922)	(346,120)	(303,312)
Operating segment
Economic net income
Income before taxes	159,641	103,576	104,325	323,919
Adjustments:
Depreciation and amortization expense	14,336	24,564	26,197	35,609
Equity compensation expense	30,336	22,393	91,576	73,974
Transaction support expense	3,490	4,777	9,815	10,757
Deferred placement fees	2,942	4,366	18,677	17,319
Other (income) expense, net	9,518	(461)	9,518	(460)
Total performance (income) loss-unrealized	(52,488)	(181,174)	77,866	(426,411)
Total performance related compensation - unrealized	24,818	137,174	(61,010)	311,936
Total investment (income) loss-unrealized	89	(1,094)	73,039	(9,309)
Realized income	208,122	154,419	575,142	461,320
Total performance income - realized	(123,265)	(7,314)	(319,660)	(111,881)
Total performance related compensation - realized	97,538	2,042	252,575	76,488
Total investment income - realized	(14,494)	(7,007)	(39,372)	(28,332)
Fee related earnings	167,901	142,140	468,685	397,595
Operating segment | Consolidated Funds
Adjustments:
(Income) loss before taxes of non-controlling interests in Consolidated Funds, net of eliminations	(42,744)	(16,054)	38,446	(41,178)
OMG
Adjustments:
OMG expense, net	59,250	55,553	171,012	162,556
Realized income	61,714	56,012	179,341	163,970
Total performance income - realized	0	0	0	0
Total performance related compensation - realized	0	0	0	0
Total investment income - realized	644	546	7,548	1,343
Fee related earnings	(61,070)	(55,466)	(171,793)	(162,627)
Subsidiaries | Operating segment
Adjustments:
(Income) loss before taxes of non-controlling interests in Consolidated Funds, net of eliminations	$ (1,066)	$ 799	$ 15,681	$ 2,608