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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 5,889,952 | $ 5,409,152 | $ 5,166,605
Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,733,550 | 1,563,847 | 1,495,264
Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,377,909 | 1,419,385 | 1,311,579
Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 895,120 | 609,913 | 575,300
Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,183,883 | 1,102,041 | 962,697
Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 699,490 | 713,966 | 821,765
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 5,352,423 | 4,869,180 | 4,576,167
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 537,529 | 539,972 | 590,438
Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 5,004,747 | 4,511,442 | 4,171,706
Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 884,798 | 897,263 | 994,392
Operating segments | Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,960,325 | 4,469,909 | 4,144,973
Operating segments | Environmental Services | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,733,550 | 1,563,847 | 1,495,264
Operating segments | Environmental Services | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,377,502 | 1,418,938 | 1,311,072
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 895,120 | 609,913 | 575,300
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 954,153 | 877,211 | 763,337
Operating segments | Environmental Services | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Environmental Services | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,510,845 | 4,022,394 | 3,675,880
Operating segments | Environmental Services | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 449,480 | 447,515 | 469,093
Operating segments | Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 929,220 | 938,796 | 1,021,125
Operating segments | Safety-Kleen Sustainability Solutions | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 229,730 | 224,830 | 199,360
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 699,490 | 713,966 | 821,765
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 841,171 | 846,339 | 899,780
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 88,049 | 92,457 | 121,345
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 407 | 447 | 507
Corporate | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 407 | 447 | 507
Corporate | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 407 | 447 | 507
Corporate | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 0 | $ 0 | $ 0

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