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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 5,166,605 | $ 3,805,566 | $ 3,144,097
Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,495,264 | 1,209,624 | 1,062,714
Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,311,579 | 706,298 | 480,621
Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 575,300 | 466,380 | 461,036
Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 962,697 | 805,491 | 809,236
Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 821,765 | 617,773 | 330,490
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,576,167 | 3,324,953 | 2,739,557
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 590,438 | 480,613 | 404,540
Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,171,706 | 3,032,454 | 2,635,901
Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 994,392 | 772,813 | 507,906
Operating segments | Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,144,973 | 3,025,907 | 2,637,641
Operating segments | Environmental Services | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,495,264 | 1,209,624 | 1,062,714
Operating segments | Environmental Services | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,311,072 | 705,999 | 480,331
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 575,300 | 466,380 | 461,036
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 763,337 | 643,904 | 633,560
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 | 3,675,880 | 2,631,112 | 2,287,796
Operating segments | Environmental Services | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 469,093 | 394,795 | 349,845
Operating segments | Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,021,125 | 779,360 | 506,166
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 | 199,360 | 161,587 | 175,676
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 821,765 | 617,773 | 330,490
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 899,780 | 693,542 | 452,435
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 121,345 | 85,818 | 53,731
Corporate, non-segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 507 | 299 | 290
Corporate, non-segment | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 507 | 299 | 290
Corporate, non-segment | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 507 | 299 | (674)
Corporate, non-segment | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 0 | $ 0 | $ 964

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