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SEGMENT REPORTING - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 2,541,067	$ 2,447,941
Goodwill	1,479,050	1,477,199	$ 1,287,736
Permits and other intangibles, net	653,027	701,987
Total	2,132,077	2,179,186
Environmental Services
Segment Reporting Information [Line Items]
Goodwill	1,297,478	1,296,204	1,112,013
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Goodwill	181,572	180,995	$ 175,723
Operating segments | Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,929,643	1,865,611
Goodwill	1,297,478	1,296,204
Permits and other intangibles, net	510,919	549,482
Total	1,808,397	1,845,686
Operating segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Property, plant and equipment, net	492,400	463,538
Goodwill	181,572	180,995
Permits and other intangibles, net	142,108	152,505
Total	323,680	333,500
Corporate
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 119,024	$ 118,792

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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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