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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 5,889,952 | $ 5,409,152 | $ 5,166,605
Total Segment Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 5,889,545 | 5,408,705 | 5,166,098
Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 5,004,747 | 4,511,442 | 4,171,706
Safety-Kleen Sustainability Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 884,798 | 897,263 | 994,392
Intersegment revenues (expense), net | Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 44,422 | 41,533 | 26,733
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (44,422) | (41,533) | (26,733)
Operating Segments | Total Segment Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 5,889,545 | 5,408,705 | 5,166,098
Operating Segments | Environmental Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 4,960,325 | 4,469,909 | 4,144,973
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 929,220 | 938,796 | 1,021,125
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 407 | $ 447 | $ 507

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