RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	Jun. 21, 2019	Jun. 01, 2019	Jun. 30, 2018	Jun. 25, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Ares Management L.P
Due from affiliates:
Due from affiliates			$ 172,428			$ 165,750
Due to affiliates:
Due to affiliates			62,344			39,184
Ares Management L.P | Affiliated entity
Due from affiliates:
Management fees receivable from non-consolidated funds			132,132			126,506
Payments made on behalf of and amounts due from non-consolidated funds and employees			40,296			39,244
Due to affiliates:
Management fee rebate payable to non-consolidated funds			2,603			5,213
Management fees received in advance			4,746			1,729
Tax receivable agreement liability			12,925			3,503
Payable to company employees			24,701			24,542
Payments made by non-consolidated funds on behalf of and payable by the Company			17,369			4,197
Ares Management L.P | Affiliated entity | ARCC
Due to affiliates:
Asset coverage percentage				200.00%
Annual base management fee percentage				1.50%
Ares Management L.P | Affiliated entity | ARCC | Forecast
Due to affiliates:
Asset coverage percentage		150.00%
Annual base management fee percentage	1.00%
Debt to equity ratio	1.0
Ares Management L.P | Affiliated entity | ARCC | Rent and other occupancy expenses
Due to affiliates:
Due to affiliates			11,800		$ 600	2,200	$ 3,000	$ 3,200	$ 2,900
Consolidated Funds
Due from affiliates:
Due from affiliates			13,704			15,884
Due to affiliates:
Due to affiliates			0			0
Consolidated Funds | Affiliated entity
Due from affiliates:
Due from affiliates			$ 13,704			$ 15,884