DEBT - Debt Issuance Costs (Details) - Ares Management L.P $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Credit Facility
Debt Issuance Costs
Unamortized debt issuance costs, beginning balance	$ 5,232
Debt issuance costs incurred	1,282
Amortization of debt issuance costs	(929)
Unamortized debt issuance costs, ending balance	5,585
Senior Notes
Debt Issuance Costs
Unamortized debt issuance costs, beginning balance	4,283
Debt issuance costs incurred	0
Amortization of debt issuance costs	(446)
Unamortized debt issuance costs, ending balance	3,837
Subordinated Notes
Debt Issuance Costs
Unamortized debt issuance costs, beginning balance	0
Debt issuance costs incurred	5,568
Amortization of debt issuance costs	(46)
Unamortized debt issuance costs, ending balance	$ 5,522