GOODWILL AND OTHER INTANGIBLE ASSETS - Changes to Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,227,042	$ 527,023
Increase from current period acquisitions	34,510	699,812
Measurement period adjustments from prior period acquisitions	(6,762)
Decrease from disposition of business	(4,412)
Foreign currency translation	(3,500)	207
Goodwill, end of period	1,246,878	1,227,042
Environmental Services
Goodwill [Roll Forward]
Goodwill, beginning of period	1,085,534	401,918
Increase from current period acquisitions	0	683,463
Measurement period adjustments from prior period acquisitions	(6,762)
Decrease from disposition of business	(4,412)
Foreign currency translation	(2,514)	153
Goodwill, end of period	1,071,846	1,085,534
Safety-Kleen Sustainability Solutions
Goodwill [Roll Forward]
Goodwill, beginning of period	141,508	125,105
Increase from current period acquisitions	34,510	16,349
Measurement period adjustments from prior period acquisitions	0
Decrease from disposition of business	0
Foreign currency translation	(986)	54
Goodwill, end of period	$ 175,032	$ 141,508