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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 1,376,695 | $ 1,307,387
Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 407,491 | 366,509
Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 359,499 | 336,486
Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 163,469 | 148,086
Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 283,943 | 259,567
Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 162,293 | 196,739
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,247,472 | 1,180,462
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 129,223 | 126,925
Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,172,510 | 1,070,741
Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 204,083 | 236,539
Operating Segments | Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,161,279 | 1,060,982
Operating Segments | Environmental Services | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 407,491 | 366,509
Operating Segments | Environmental Services | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 359,397 | 336,379
Operating Segments | Environmental Services | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 163,469 | 148,086
Operating Segments | Environmental Services | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 230,922 | 210,008
Operating Segments | Environmental Services | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Environmental Services | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,053,458 | 958,584
Operating Segments | Environmental Services | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 107,821 | 102,398
Operating Segments | Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 215,314 | 246,298
Operating Segments | Safety-Kleen Sustainability Solutions | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 53,021 | 49,559
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 162,293 | 196,739
Operating Segments | Safety-Kleen Sustainability Solutions | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 193,912 | 221,771
Operating Segments | Safety-Kleen Sustainability Solutions | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 21,402 | 24,527
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 102 | 107
Corporate | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 102 | 107
Corporate | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 102 | 107
Corporate | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 0 | $ 0

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