FAIR VALUE (Changes in Fair Value of Level III Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Funds
Changes in the fair value of the Level III investments
Balance, beginning of period	$ 700,059	$ 918,796	$ 970,837	$ 663,702
Deconsolidation of fund			(184,918)	(233)
Transfer in	122,554	118,748	85,179	68,665
Transfer out	(103,148)	(264,659)	(199,498)	(49,463)
Purchases	97,721	133,784	303,785	287,278
Sales/settlements	(122,643)	(77,596)	(288,580)	(162,953)
Amortized discounts/premiums	90	(42)	21	(72)
Realized and unrealized appreciation (depreciation), net	1,973	5,964	9,780	28,071
Balance, end of period	696,606	834,995	696,606	834,995
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	2,930	(9,571)	6,678	29,962
Consolidated Funds | Equity securities
Changes in the fair value of the Level III investments
Balance, beginning of period	131,732	184,583	150,752	162,577
Deconsolidation of fund			(10,325)	0
Transfer in	0	0	0	0
Transfer out	0	0	0	0
Purchases	710	0	11,595	0
Sales/settlements	(13,597)	0	(18,734)	0
Amortized discounts/premiums	0	0	0	0
Realized and unrealized appreciation (depreciation), net	(4,004)	(4,224)	(18,447)	17,782
Balance, end of period	114,841	180,359	114,841	180,359
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	(3,582)	(13,164)	(18,018)	17,782
Consolidated Funds | Fixed Income
Changes in the fair value of the Level III investments
Balance, beginning of period	274,412	482,375	547,958	267,889
Deconsolidation of fund			(174,593)	(233)
Transfer in	122,554	118,624	85,179	68,665
Transfer out	(103,148)	(264,659)	(199,498)	(49,463)
Purchases	95,011	124,784	282,190	262,278
Sales/settlements	(102,198)	(78,395)	(260,422)	(163,559)
Amortized discounts/premiums	107	(46)	17	(62)
Realized and unrealized appreciation (depreciation), net	(1,578)	1,350	4,329	(1,482)
Balance, end of period	285,160	384,033	285,160	384,033
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	(765)	3,468	1,017	593
Consolidated Funds | Partnership interests
Changes in the fair value of the Level III investments
Balance, beginning of period	293,857	251,608	271,447	232,332
Deconsolidation of fund			0	0
Transfer in	0	0	0	0
Transfer out	0	0	0	0
Purchases	2,000	9,000	10,000	25,000
Sales/settlements	(5,000)	0	(7,000)	0
Amortized discounts/premiums	0	0	0	0
Realized and unrealized appreciation (depreciation), net	8,300	9,174	24,710	12,450
Balance, end of period	299,157	269,782	299,157	269,782
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	8,300	0	24,710	12,450
Consolidated Funds | Derivatives, Net
Changes in the fair value of the Level III investments
Balance, beginning of period	58	230	680	904
Deconsolidation of fund			0	0
Transfer in	0	124	0	0
Transfer out	0	0	0	0
Purchases	0	0	0	0
Sales/settlements	(1,848)	799	(2,424)	606
Amortized discounts/premiums	(17)	4	4	(10)
Realized and unrealized appreciation (depreciation), net	(745)	(336)	(812)	(679)
Balance, end of period	(2,552)	821	(2,552)	821
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	(1,023)	125	(1,031)	(863)
Ares Management L.P
Changes in the fair value of the Level III investments
Balance, beginning of period	111,640	69,344	106,413	239,927
Deconsolidation of fund			10,021	78
Transfer in		500		250
Purchases	25,010	3,064	29,157	52,045
Sales/settlements	(5,243)	(1,976)	(16,413)	(222,546)
Realized and unrealized appreciation (depreciation), net	(1,305)	3,942	924	5,120
Balance, end of period	130,102	74,874	130,102	74,874
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	(1,357)	3,977	1,121	5,559
Ares Management L.P | Equity securities
Changes in the fair value of the Level III investments
Balance, beginning of period	12,397	0	10,397	0
Deconsolidation of fund			0	0
Transfer in		500		250
Purchases	0	750	2,000	1,000
Sales/settlements	0	0	0	0
Realized and unrealized appreciation (depreciation), net	0	9,147	0	9,147
Balance, end of period	12,397	10,397	12,397	10,397
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	0	9,147	0	9,147
Ares Management L.P | Fixed Income
Changes in the fair value of the Level III investments
Balance, beginning of period	64,051	22,125	60,824	195,158
Deconsolidation of fund			10,021	78
Transfer in		0
Purchases	25,010	2,314	27,157	51,045
Sales/settlements	(5,243)	(1,976)	(16,413)	(222,546)
Realized and unrealized appreciation (depreciation), net	(1,305)	185	924	(1,087)
Balance, end of period	82,513	22,648	82,513	22,648
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	(1,357)	220	1,121	(648)
Ares Management L.P | Partnership interests
Changes in the fair value of the Level III investments
Balance, beginning of period	35,192	47,219	35,192	44,769
Deconsolidation of fund			0	0
Transfer in		0
Purchases	0	0	0	0
Sales/settlements	0	0	0	0
Realized and unrealized appreciation (depreciation), net	0	(5,390)	0	(2,940)
Balance, end of period	35,192	41,829	35,192	41,829
Increase (decrease) in net unrealized appreciation/depreciation included in earnings related to financial assets still held at the reporting date	$ 0	$ (5,390)	$ 0	$ (2,940)