OTHER ASSETS (Depreciable assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation	$ 17,100	$ 16,100	$ 12,600
Fully depreciated	5,200
Ares Management L.P
Property, Plant and Equipment [Line Items]
Fixed assets, gross	123,032	111,757
Less: accumulated depreciation	(60,149)	(48,377)
Fixed assets, net	62,883	63,380
Furniture | Ares Management L.P
Property, Plant and Equipment [Line Items]
Fixed assets, gross	9,484	9,536
Office and computer equipment | Ares Management L.P
Property, Plant and Equipment [Line Items]
Fixed assets, gross	19,963	19,722
Internal-use software | Ares Management L.P
Property, Plant and Equipment [Line Items]
Fixed assets, gross	36,966	29,005
Leasehold improvements | Ares Management L.P
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 56,619	$ 53,494