OTHER ASSETS (Depreciable assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fixed assets, net
Depreciation expense	$ 12,600	$ 8,200	$ 6,900
Fixed assets full depreciated	11,200
Ares Management L.P
Fixed assets, net
Fixed assets, at cost	99,543	77,178
Less: accumulated depreciation	(38,392)	(36,419)
Fixed assets, net	61,151	40,759
Furniture | Ares Management L.P
Fixed assets, net
Fixed assets, at cost	9,303	8,498
Office and computer equipment | Ares Management L.P
Fixed assets, net
Fixed assets, at cost	19,164	16,712
Internal use software | Ares Management L.P
Fixed assets, net
Fixed assets, at cost	19,055	10,974
Leasehold improvements | Ares Management L.P
Fixed assets, net
Fixed assets, at cost	$ 52,021	$ 40,994