GOODWILL AND OTHER INTANGIBLE ASSETS - Changes to Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,477,199
Measurement period adjustments from prior period acquisitions	47
Foreign currency translation	61
Goodwill, ending balance	1,477,307
Environmental Services
Goodwill [Roll Forward]
Goodwill, beginning balance	1,296,204
Measurement period adjustments from prior period acquisitions	146
Foreign currency translation	44
Goodwill, ending balance	1,296,394
Safety-Kleen Sustainability Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	180,995
Measurement period adjustments from prior period acquisitions	(99)
Foreign currency translation	17
Goodwill, ending balance	$ 180,913