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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,552,719 | $ 1,397,900 | $ 2,929,414 | $ 2,705,287
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 443,668 | 389,908 | 851,159 | 756,417
Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 359,570 | 399,661 | 719,069 | 736,147
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 252,893 | 154,359 | 416,362 | 302,445
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 299,687 | 280,122 | 583,630 | 539,689
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 196,901 | 173,850 | 359,194 | 370,589
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,408,216 | 1,254,849 | 2,655,688 | 2,435,311
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 144,503 | 143,051 | 273,726 | 269,976
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,309,383 | 1,172,036 | 2,481,893 | 2,242,777
Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 243,237 | 225,748 | 447,320 | 462,287
Operating Segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,297,298 | 1,161,482 | 2,458,577 | 2,222,464
Operating Segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 443,668 | 389,908 | 851,159 | 756,417
Operating Segments | Environmental Services | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 359,471 | 399,545 | 718,868 | 735,924
Operating Segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 252,893 | 154,359 | 416,362 | 302,445
Operating Segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 241,266 | 217,670 | 472,188 | 427,678
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 | 1,175,328 | 1,041,739 | 2,228,786 | 2,000,323
Operating Segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 121,970 | 119,743 | 229,791 | 222,141
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 255,322 | 236,302 | 470,636 | 482,600
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 and Other |  |  |  |
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 | 58,421 | 62,452 | 111,442 | 112,011
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 196,901 | 173,850 | 359,194 | 370,589
Operating Segments | Safety-Kleen Sustainability Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 232,789 | 212,994 | 426,701 | 434,765
Operating Segments | Safety-Kleen Sustainability Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,533 | 23,308 | 43,935 | 47,835
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 99 | 116 | 201 | 223
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 99 | 116 | 201 | 223
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 | 99 | 116 | 201 | 223
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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