RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Jun. 30, 2017	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
ARCC | American Capital Ltd.
Due to affiliates:
Maximum fees waived	$ 10,000,000.0	$ 10,000,000.0	$ 30,000,000.0
Consolidated Funds
Due from affiliates:
Due from affiliates				$ 8,684,000	$ 6,192,000
Due to affiliates:
Due to affiliates				0	0
Consolidated Funds | Affiliated entity
Due from affiliates:
Due from affiliates				8,684,000	6,192,000
Ares Management L.P
Due from affiliates:
Due from affiliates				328,059,000	268,099,000
Due to affiliates:
Due to affiliates				63,853,000	71,445,000
Ares Management L.P | Affiliated entity
Due from affiliates:
Management fees receivable from non-consolidated funds				257,029,000	203,554,000
Payments made on behalf of and amounts due from non-consolidated funds and employees				71,030,000	64,545,000
Due to affiliates:
Management fee rebate payable to non-consolidated funds				1,725,000	2,420,000
Management fees received in advance				6,291,000	3,012,000
Tax receivable agreement liability				36,443,000	26,542,000
Undistributed carried interest and incentive fees				4,369,000	28,086,000
Payments made by non-consolidated funds on behalf of and payable by the Company				$ 15,025,000	$ 11,385,000