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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes to Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,477,199
Measurement period adjustments from prior period acquisitions	47
Foreign currency translation	1,585
Goodwill, ending balance	1,478,831
Environmental Services
Goodwill [Roll Forward]
Goodwill, beginning balance	1,296,204
Measurement period adjustments from prior period acquisitions	146
Foreign currency translation	1,130
Goodwill, ending balance	1,297,480
Safety-Kleen Sustainability Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	180,995
Measurement period adjustments from prior period acquisitions	(99)
Foreign currency translation	455
Goodwill, ending balance	$ 181,351

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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