GOODWILL AND OTHER INTANGIBLE ASSETS - Changes to Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,246,878	$ 1,227,042
Increase from current period acquisitions	39,346	34,510
Measurement period adjustments from prior period acquisition	360	(6,762)
Decrease from disposition of business		(4,412)
Foreign currency translation	1,152	(3,500)
Goodwill, end of period	1,287,736	1,246,878
Environmental Services
Goodwill [Roll Forward]
Goodwill, beginning of period	1,071,846	1,085,534
Increase from current period acquisitions	39,346	0
Measurement period adjustments from prior period acquisition	0	(6,762)
Decrease from disposition of business		(4,412)
Foreign currency translation	821	(2,514)
Goodwill, end of period	1,112,013	1,071,846
Safety-Kleen Sustainability Solutions
Goodwill [Roll Forward]
Goodwill, beginning of period	175,032	141,508
Increase from current period acquisitions	0	34,510
Measurement period adjustments from prior period acquisition	360	0
Decrease from disposition of business		0
Foreign currency translation	331	(986)
Goodwill, end of period	$ 175,723	$ 175,032