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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 3,805,566 | $ 3,144,097 | $ 3,412,190
Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,209,624 | 1,062,714 | 1,120,043
Field and Emergency Response |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 466,380 | 461,036 | 340,906
Field and Emergency Response | HydroChemPSC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 28,400 |  |
Industrial Services And Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 706,298 | 480,621 | 632,550
Industrial Services And Other | HydroChemPSC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 137,700 |  |
Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 805,491 | 809,236 | 851,520
Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 617,773 | 330,490 | 467,171
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,324,953 | 2,739,557 | 2,940,832
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 480,613 | 404,540 | 471,358
Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,032,454 | 2,635,901 | 2,795,994
Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 772,813 | 507,906 | 615,060
Operating segments | Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,025,907 | 2,637,641 | 2,802,682
Operating segments | Environmental Services | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,209,624 | 1,062,714 | 1,120,043
Operating segments | Environmental Services | Field and Emergency Response |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 466,380 | 461,036 | 340,906
Operating segments | Environmental Services | Industrial Services And Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 705,999 | 480,331 | 631,414
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 643,904 | 633,560 | 710,319
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 | 2,631,112 | 2,287,796 | 2,390,718
Operating segments | Environmental Services | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 394,795 | 349,845 | 411,964
Operating segments | Safety-Kleen Sustainability Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 779,360 | 506,166 | 608,372
Operating segments | Safety-Kleen Sustainability Solutions | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response |  |  |
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 | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 161,587 | 175,676 | 141,201
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 617,773 | 330,490 | 467,171
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 693,542 | 452,435 | 550,700
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 85,818 | 53,731 | 57,672
Corporate, non-segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 299 | 290 | 1,136
Corporate, non-segment | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Field and Emergency Response |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Industrial Services And Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 299 | 290 | 1,136
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 | 299 | (674) | (586)
Corporate, non-segment | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 0 | $ 964 | $ 1,722

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