FAIR VALUE - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Consolidated Funds
Assets, at fair value
Collateralized loan obligations and other fixed income	$ 10,852,660	$ 10,410,442
Common stock and other equity securities	264,202	227,031
Partnership interests	244,157	239,624
Total investments, at fair value	11,361,019	10,877,097
Total derivative assets, at fair value	325
Total assets, at fair value	11,361,344	10,878,201
Liabilities, at fair value
Derivative liabilities	(18,513)
Loan obligations of CLOs	(10,174,794)	(9,958,076)
Total liabilities, at fair value	(10,193,307)	(9,958,120)
Consolidated Funds | Asset swaps-other
Assets, at fair value
Total derivative assets, at fair value	325	1,104
Liabilities, at fair value
Derivative liabilities	(1,513)	(44)
Consolidated Funds | Warrants
Liabilities, at fair value
Derivative liabilities	(17,000)
Consolidated Funds | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	28,500
Consolidated Funds | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	434,226	397,494
Consolidated Funds | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	9,389,769	10,012,948
Consolidated Funds | U.S. Treasury securities
Assets, at fair value
Collateralized loan obligations and other fixed income	1,000,165
Consolidated Funds | Level I
Assets, at fair value
Collateralized loan obligations and other fixed income	1,000,165	0
Common stock and other equity securities	3,366	5,749
Partnership interests	0	0
Total investments, at fair value	1,003,531	5,749
Total derivative assets, at fair value	0
Total assets, at fair value	1,003,531	5,749
Liabilities, at fair value
Derivative liabilities	(17,000)
Loan obligations of CLOs	0	0
Total liabilities, at fair value	(17,000)	0
Consolidated Funds | Level I  | Asset swaps-other
Assets, at fair value
Total derivative assets, at fair value	0	0
Liabilities, at fair value
Derivative liabilities	0	0
Consolidated Funds | Level I  | Warrants
Liabilities, at fair value
Derivative liabilities	(17,000)
Consolidated Funds | Level I  | Collateralized loan obligations and other fixed income, at fair value
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 I  | U.S. Treasury securities
Assets, at fair value
Collateralized loan obligations and other fixed income	1,000,165
Consolidated Funds | Level II
Assets, at fair value
Collateralized loan obligations and other fixed income	9,449,819	9,868,136
Common stock and other equity securities	1,590	239
Partnership interests	0	0
Total investments, at fair value	9,451,409	9,868,375
Total derivative assets, at fair value	0
Total assets, at fair value	9,451,409	9,868,375
Liabilities, at fair value
Derivative liabilities	0
Loan obligations of CLOs	(10,174,794)	(9,958,076)
Total liabilities, at fair value	(10,174,794)	(9,958,076)
Consolidated Funds | Level II  | Asset swaps-other
Assets, at fair value
Total derivative assets, at fair value	0	0
Liabilities, at fair value
Derivative liabilities	0	0
Consolidated Funds | Level II  | Warrants
Liabilities, at fair value
Derivative liabilities	0
Consolidated Funds | Level II  | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	28,500
Consolidated Funds | Level II  | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	406,253	397,485
Consolidated Funds | Level II  | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	9,015,066	9,470,651
Consolidated Funds | Level II  | U.S. Treasury securities
Assets, at fair value
Collateralized loan obligations and other fixed income	0
Consolidated Funds | Level III
Assets, at fair value
Collateralized loan obligations and other fixed income	402,676	542,306
Common stock and other equity securities	259,246	221,043
Partnership interests	237,558	231,857
Total investments, at fair value	899,480	995,206
Total derivative assets, at fair value	325
Total assets, at fair value	899,805	996,310
Liabilities, at fair value
Derivative liabilities	(1,513)	(44)
Loan obligations of CLOs	0	0
Total liabilities, at fair value	(1,513)	(44)
Consolidated Funds | Level III  | Asset swaps-other
Assets, at fair value
Total derivative assets, at fair value	325	1,104
Liabilities, at fair value
Derivative liabilities	(1,513)	(44)
Consolidated Funds | Level III  | Warrants
Liabilities, at fair value
Derivative liabilities	0
Consolidated Funds | Level III  | Collateralized loan obligations and other fixed income, at fair value
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	27,973	9
Consolidated Funds | Level III  | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	374,703	542,297
Consolidated Funds | Level III  | U.S. Treasury securities
Assets, at fair value
Collateralized loan obligations and other fixed income	0
Consolidated Funds | Investments Measured at NAV
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Common stock and other equity securities	0	0
Partnership interests	6,599	7,767
Total investments, at fair value	6,599	7,767
Total derivative assets, at fair value	0
Total assets, at fair value	6,599	7,767
Liabilities, at fair value
Derivative liabilities	0
Loan obligations of CLOs	0	0
Total liabilities, at fair value	0	0
Consolidated Funds | Investments Measured at NAV | Asset swaps-other
Assets, at fair value
Total derivative assets, at fair value	0	0
Liabilities, at fair value
Derivative liabilities	0	0
Consolidated Funds | Investments Measured at NAV | Warrants
Liabilities, at fair value
Derivative liabilities	0
Consolidated Funds | Investments Measured at NAV | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	0
Consolidated Funds | Investments Measured at NAV | Bonds
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Consolidated Funds | Investments Measured at NAV | Loans
Assets, at fair value
Collateralized loan obligations and other fixed income	0	0
Consolidated Funds | Investments Measured at NAV | U.S. Treasury securities
Assets, at fair value
Collateralized loan obligations and other fixed income	0
Ares Management L.P
Assets, at fair value
Common stock and other equity securities	109,807	89,419
Partnership interests	8,618	3,784
Total investments, at fair value	172,732	146,552
Total assets, at fair value	177,093	147,992
Liabilities, at fair value
Derivative liabilities		(1,565)
Contingent consideration	(41,413)
Total liabilities, at fair value	(41,678)	(1,565)
Ares Management L.P | Derivatives-foreign exchange contracts and interest rate contracts
Assets, at fair value
Total derivative assets, at fair value	4,361
Ares Management L.P | Derivatives-foreign exchange contracts
Assets, at fair value
Total derivative assets, at fair value		1,440
Liabilities, at fair value
Derivative liabilities	(265)
Ares Management L.P | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	54,307	53,349
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 assets, at fair value	0	0
Liabilities, at fair value
Derivative liabilities		0
Contingent consideration	0
Total liabilities, at fair value	0	0
Ares Management L.P | Level I  | Derivatives-foreign exchange contracts and interest rate contracts
Assets, at fair value
Total derivative assets, at fair value	0
Ares Management L.P | Level I  | Derivatives-foreign exchange contracts
Assets, at fair value
Total derivative assets, at fair value		0
Liabilities, at fair value
Derivative liabilities	0
Ares Management L.P | Level I  | Collateralized loan obligations and other fixed income, at fair value
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	1,410	1,007
Partnership interests	0	0
Total investments, at fair value	1,410	1,007
Total assets, at fair value	5,771	2,447
Liabilities, at fair value
Derivative liabilities		(1,565)
Contingent consideration	0
Total liabilities, at fair value	(265)	(1,565)
Ares Management L.P | Level II  | Derivatives-foreign exchange contracts and interest rate contracts
Assets, at fair value
Total derivative assets, at fair value	4,361
Ares Management L.P | Level II  | Derivatives-foreign exchange contracts
Assets, at fair value
Total derivative assets, at fair value		1,440
Liabilities, at fair value
Derivative liabilities	(265)
Ares Management L.P | Level II  | Collateralized loan obligations and other fixed income, at fair value
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	108,397	88,412
Partnership interests	2,575	2,575
Total investments, at fair value	165,279	144,336
Total assets, at fair value	165,279	144,336
Liabilities, at fair value
Derivative liabilities		0
Contingent consideration	(41,413)
Total liabilities, at fair value	(41,413)	0
Ares Management L.P | Level III  | Derivatives-foreign exchange contracts and interest rate contracts
Assets, at fair value
Total derivative assets, at fair value	0
Ares Management L.P | Level III  | Derivatives-foreign exchange contracts
Assets, at fair value
Total derivative assets, at fair value		0
Liabilities, at fair value
Derivative liabilities	0
Ares Management L.P | Level III  | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	54,307	53,349
Ares Management L.P | Investments Measured at NAV
Assets, at fair value
Common stock and other equity securities	0	0
Partnership interests	6,043	1,209
Total investments, at fair value	6,043	1,209
Total assets, at fair value	6,043	1,209
Liabilities, at fair value
Derivative liabilities		0
Contingent consideration	0
Total liabilities, at fair value	0	0
Ares Management L.P | Investments Measured at NAV | Derivatives-foreign exchange contracts and interest rate contracts
Assets, at fair value
Total derivative assets, at fair value	0
Ares Management L.P | Investments Measured at NAV | Derivatives-foreign exchange contracts
Assets, at fair value
Total derivative assets, at fair value		0
Liabilities, at fair value
Derivative liabilities	0
Ares Management L.P | Investments Measured at NAV | Collateralized loan obligations and other fixed income, at fair value
Assets, at fair value
Collateralized loan obligations and other fixed income	$ 0	$ 0