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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Total revenues | $ 1,376,695 | $ 1,307,387
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,172,510 | 1,070,741
Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 204,083 | 236,539
Operating Segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,161,279 | 1,060,982
Operating Segments | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 215,314 | 246,298
Intersegment Revenues (Expenses), net | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 11,231 | 9,759
Intersegment Revenues (Expenses), net | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (11,231) | (9,759)
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 102 | $ 107

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