EQUITY COMPENSATION - Equity Incentive Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021
Equity compensation
Equity-based compensation expense	$ 237,191	$ 122,986	$ 97,691
Restricted units
Equity compensation
Equity-based compensation expense	170,980	115,680	88,979
Restricted units with a market condition
Equity compensation
Equity-based compensation expense	66,211	7,263	3,613
Options
Equity compensation
Equity-based compensation expense	0	43	4,362
Phantom Shares
Equity compensation
Equity-based compensation expense	$ 0	$ 0	$ 737
Ares Management L.P
Equity compensation
Total number of shares available for grant under the equity incentive plan (in shares)	38,851,930			44,510,451