RELATED PARTY TRANSACTIONS (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jan. 03, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 21, 2019	Jun. 30, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ARCC | American Capital Ltd.
Due to affiliates:
Maximum fees waived		$ 10,000,000	$ 30,000,000.0	$ 40,000,000.0	$ 30,000,000.0
Consolidated Funds
Due from affiliates:
Due from affiliates			6,192,000	17,609,000
Due to affiliates:
Due to affiliates			0	0
Consolidated Funds | Affiliated entity
Due from affiliates:
Due from affiliates			6,192,000	17,609,000
Ares Management L.P
Due from affiliates:
Due from affiliates			268,099,000	199,377,000
Due to affiliates:
Due to affiliates			71,445,000	82,411,000
Transaction support expense			0	0	275,177,000
Ares Management L.P | Affiliated entity
Due from affiliates:
Management fees receivable from non-consolidated funds			203,554,000	151,455,000
Payments made on behalf of and amounts due from non-consolidated funds and employees			64,545,000	47,922,000
Due to affiliates:
Management fee rebate payable to non-consolidated funds			2,420,000	2,105,000
Management fees received in advance			3,012,000	5,491,000
Tax receivable agreement liability			26,542,000	24,927,000
Undistributed carried interest and incentive fees			28,086,000	31,162,000
Payments made by non-consolidated funds on behalf of and payable by the Company			$ 11,385,000	18,726,000
Ares Management L.P | Affiliated entity | ARCC
Due to affiliates:
Asset coverage percentage			200.00%			150.00%
Annual base management fee percentage			1.50%			1.00%
Debt to equity ratio						1.0
Payments to acquire businesses	$ 4,200,000,000
Ares Management L.P | Affiliated entity | ARCC | Rent and other occupancy expenses
Due to affiliates:
Due to affiliates			$ 11,800,000	$ 11,800,000	$ 2,200,000		$ 600,000	$ 3,000,000.0	$ 3,200,000	$ 2,900,000
Ares Management L.P | Affiliated entity | American Capital Ltd.
Due to affiliates:
Transaction support expense	$ 275,200,000