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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 1,459,537 | $ 1,431,950
Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 448,313 | 426,205
Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 302,561 | 322,455
Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 231,358 | 215,702
Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 338,189 | 307,674
Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 139,116 | 159,914
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,351,381 | 1,316,383
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 108,156 | 115,567
Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,252,526 | 1,209,113
Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 207,011 | 222,740
Operating Segments | Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,242,448 | 1,207,038
Operating Segments | Environmental Services | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 448,313 | 426,205
Operating Segments | Environmental Services | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 302,561 | 322,358
Operating Segments | Environmental Services | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 231,358 | 215,702
Operating Segments | Environmental Services | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 260,216 | 242,773
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 | 1,151,108 | 1,116,267
Operating Segments | Environmental Services | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 91,340 | 90,771
Operating Segments | Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 217,089 | 224,815
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 | 77,973 | 64,901
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 139,116 | 159,914
Operating Segments | Safety-Kleen Sustainability Solutions | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 200,273 | 200,019
Operating Segments | Safety-Kleen Sustainability Solutions | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 16,816 | 24,796
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 97
Corporate | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 97
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 | 0 | 97
Corporate | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 0 | $ 0

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