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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 1,365,696 | $ 1,363,086 | $ 4,070,983 | $ 3,888,507
Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,146,363 | 1,086,484 | 3,389,140 | 3,124,672
Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 219,221 | 276,319 | 681,508 | 763,401
Operating Segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,135,279 | 1,080,032 | 3,357,743 | 3,105,336
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 230,305 | 282,771 | 712,905 | 782,737
Intersegment Revenues (Expenses), net | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 11,084 | 6,452 | 31,397 | 19,336
Intersegment Revenues (Expenses), net | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (11,084) | (6,452) | (31,397) | (19,336)
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 112 | $ 283 | $ 335 | $ 434

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