FAIR VALUE (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Consolidated Funds
Assets, at fair value
Collateralized loan obligations and other fixed income	$ 10,248,425	$ 8,319,551
Common stock and other equity securities	47,197	112,384
Partnership interests	309,234	296,012
Total investments, at fair value	10,604,856	8,727,947
Derivatives-foreign exchange contracts	1,857
Total derivative assets, at fair value	10,606,713	8,728,614
Liabilities, at fair value
Derivative liabilities		(4,776)
Loan obligations of CLOs	(9,608,127)	(7,973,748)
Total liabilities, at fair value	(9,608,130)	(7,978,524)
Consolidated Funds | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts		667
Liabilities, at fair value
Derivative liabilities		(670)
Consolidated Funds | Derivatives-asset swaps-other
Assets, at fair value
Derivatives-foreign exchange contracts	1,857
Liabilities, at fair value
Derivative liabilities	(3)	(4,106)
Consolidated Funds | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income		44,435
Consolidated Funds | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	331,228	212,376
Consolidated Funds | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	9,917,197	8,062,740
Consolidated Funds | Level I
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Common stock and other equity securities	3,985	26,396
Partnership interests	0	0
Total investments, at fair value	3,985	26,396
Derivatives-foreign exchange contracts	0
Total derivative assets, at fair value	3,985	26,396
Liabilities, at fair value
Derivative liabilities		0
Loan obligations of CLOs	0	0
Total liabilities, at fair value	0	0
Consolidated Funds | Level I  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts		0
Liabilities, at fair value
Derivative liabilities		0
Consolidated Funds | Level I  | Derivatives-asset swaps-other
Assets, at fair value
Derivatives-foreign exchange contracts	0
Liabilities, at fair value
Derivative liabilities	0	0
Consolidated Funds | Level I  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income		0
Consolidated Funds | Level I  | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Consolidated Funds | Level I  | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Consolidated Funds | Level II
Assets, at fair value
Collateralized loan obligations and other fixed income	9,734,544	7,980,415
Common stock and other equity securities	0	0
Partnership interests	0	0
Total investments, at fair value	9,734,544	7,980,415
Derivatives-foreign exchange contracts	0
Total derivative assets, at fair value	9,734,544	7,981,082
Liabilities, at fair value
Derivative liabilities		(670)
Loan obligations of CLOs	(9,608,127)	(7,973,748)
Total liabilities, at fair value	(9,608,127)	(7,974,418)
Consolidated Funds | Level II  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts		667
Liabilities, at fair value
Derivative liabilities		(670)
Consolidated Funds | Level II  | Derivatives-asset swaps-other
Assets, at fair value
Derivatives-foreign exchange contracts	0
Liabilities, at fair value
Derivative liabilities	0	0
Consolidated Funds | Level II  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income		44,435
Consolidated Funds | Level II  | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	331,228	207,966
Consolidated Funds | Level II  | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	9,403,316	7,728,014
Consolidated Funds | Level III
Assets, at fair value
Collateralized loan obligations and other fixed income	513,881	339,136
Common stock and other equity securities	43,212	85,988
Partnership interests	309,234	296,012
Total investments, at fair value	866,327	721,136
Derivatives-foreign exchange contracts	1,857
Total derivative assets, at fair value	868,184	721,136
Liabilities, at fair value
Derivative liabilities		(4,106)
Loan obligations of CLOs	0	0
Total liabilities, at fair value	(3)	(4,106)
Consolidated Funds | Level III  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts		0
Liabilities, at fair value
Derivative liabilities		0
Consolidated Funds | Level III  | Derivatives-asset swaps-other
Assets, at fair value
Derivatives-foreign exchange contracts	1,857
Liabilities, at fair value
Derivative liabilities	(3)	(4,106)
Consolidated Funds | Level III  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income		0
Consolidated Funds | Level III  | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	0	4,410
Consolidated Funds | Level III  | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	513,881	334,726
Ares Management L.P
Assets, at fair value
Common stock and other equity securities	86,885	15,747
Partnership interests	4,483	36,824
Total investments, at fair value	166,982	121,754
Total derivative assets, at fair value	169,742	125,777
Liabilities, at fair value
Derivative liabilities		(113)
Total liabilities, at fair value	(284)	(113)
Ares Management L.P | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts	2,760	4,023
Liabilities, at fair value
Derivative liabilities	(284)
Ares Management L.P | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income	75,614	69,183
Ares Management L.P | Level I
Assets, at fair value
Common stock and other equity securities	0	0
Partnership interests	0	0
Total investments, at fair value	0	0
Total derivative assets, at fair value	0	0
Liabilities, at fair value
Derivative liabilities		0
Total liabilities, at fair value	0	0
Ares Management L.P | Level I  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts	0	0
Liabilities, at fair value
Derivative liabilities	0
Ares Management L.P | Level I  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Ares Management L.P | Level II
Assets, at fair value
Common stock and other equity securities	960	1,043
Partnership interests	0	0
Total investments, at fair value	960	1,043
Total derivative assets, at fair value	3,720	5,066
Liabilities, at fair value
Derivative liabilities		(113)
Total liabilities, at fair value	(284)	(113)
Ares Management L.P | Level II  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts	2,760	4,023
Liabilities, at fair value
Derivative liabilities	(284)
Ares Management L.P | Level II  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Ares Management L.P | Level III
Assets, at fair value
Common stock and other equity securities	85,925	14,704
Partnership interests	2,575	35,192
Total investments, at fair value	164,114	119,079
Total derivative assets, at fair value	164,114	119,079
Liabilities, at fair value
Derivative liabilities		0
Total liabilities, at fair value	0	0
Ares Management L.P | Level III  | Derivatives-foreign exchange contracts
Assets, at fair value
Derivatives-foreign exchange contracts	0	0
Liabilities, at fair value
Derivative liabilities	0
Ares Management L.P | Level III  | Investments in CLO warehouse
Assets, at fair value
Collateralized loan obligations and other fixed income	75,614	69,183
Ares Management L.P | Investments Measured at NAV
Assets, at fair value
Partnership interests	1,908	1,632
Total investments, at fair value	1,908	1,632
Total derivative assets, at fair value	$ 1,908	$ 1,632