SEGMENT REPORTING - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 2,447,941	$ 2,193,318
Goodwill	1,477,199	1,287,736	$ 1,246,878
Permits and other intangibles, net	701,987	602,797
Total	2,179,186	1,890,533
Environmental Services
Segment Reporting Information [Line Items]
Goodwill	1,296,204	1,112,013	1,071,846
Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Goodwill	180,995	175,723	$ 175,032
Operating segments | Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,865,611	1,651,026
Goodwill	1,296,204	1,112,013
Permits and other intangibles, net	549,482	454,919
Total	1,845,686	1,566,932
Operating segments | Safety-Kleen Sustainability Solutions
Segment Reporting Information [Line Items]
Property, plant and equipment, net	463,538	411,415
Goodwill	180,995	175,723
Permits and other intangibles, net	152,505	147,878
Total	333,500	323,601
Corporate
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 118,792	$ 130,877