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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,549,337 | $ 1,529,422 | $ 4,531,141 | $ 4,458,836
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 490,768 | 437,180 | 1,380,394 | 1,288,339
Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 332,102 | 345,669 | 1,016,226 | 1,064,738
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 232,262 | 260,200 | 690,755 | 676,562
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 340,049 | 304,372 | 982,453 | 888,002
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 154,156 | 182,001 | 461,313 | 541,195
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,396,783 | 1,385,719 | 4,116,135 | 4,041,407
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 152,554 | 143,703 | 415,006 | 417,429
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,331,300 | 1,297,187 | 3,892,448 | 3,779,080
Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 218,037 | 232,139 | 638,507 | 679,459
Operating Segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,318,580 | 1,287,650 | 3,855,677 | 3,746,227
Operating Segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 490,768 | 437,180 | 1,380,394 | 1,288,339
Operating Segments | Environmental Services | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 332,102 | 345,573 | 1,016,040 | 1,064,441
Operating Segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 232,262 | 260,200 | 690,755 | 676,562
Operating Segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 263,448 | 244,697 | 768,488 | 716,885
Operating Segments | Environmental Services | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Environmental Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,194,300 | 1,166,660 | 3,519,337 | 3,395,446
Operating Segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 124,280 | 120,990 | 336,340 | 350,781
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 230,757 | 241,676 | 675,278 | 712,312
Operating Segments | Safety-Kleen Sustainability Solutions | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 76,601 | 59,675 | 213,965 | 171,117
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 154,156 | 182,001 | 461,313 | 541,195
Operating Segments | Safety-Kleen Sustainability Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 202,483 | 218,963 | 596,612 | 645,664
Operating Segments | Safety-Kleen Sustainability Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 28,274 | 22,713 | 78,666 | 66,648
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 96 | 186 | 297
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 96 | 186 | 297
Corporate | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 96 | 186 | 297
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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