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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,356,312 | $ 926,458 | $ 2,525,421 | $ 1,734,606
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 387,019 | 306,865 | 710,675 | 578,905
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 144,860 | 106,986 | 277,219 | 212,154
Field and Emergency Response Services | HydroChemPSC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,200 |  | 62,200 |
Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 360,949 | 150,446 | 669,859 | 270,335
Industrial Services and Other | HydroChemPSC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 173,700 |  | 329,800 |
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 241,138 | 199,382 | 461,471 | 394,220
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 222,346 | 162,779 | 406,197 | 278,992
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,182,537 | 796,880 | 2,219,817 | 1,511,457
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 173,775 | 129,578 | 305,604 | 223,149
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,090,743 | 724,097 | 2,038,188 | 1,378,699
Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 265,490 | 202,282 | 487,082 | 355,749
Operating segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,084,506 | 723,147 | 2,025,304 | 1,376,025
Operating segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 387,019 | 306,865 | 710,675 | 578,905
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 144,860 | 106,986 | 277,219 | 212,154
Operating segments | Environmental Services | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 360,870 | 150,367 | 669,708 | 270,177
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 191,757 | 158,929 | 367,702 | 314,789
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 | 945,579 | 616,585 | 1,780,257 | 1,192,093
Operating segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 138,927 | 106,562 | 245,047 | 183,932
Operating segments | Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 271,727 | 203,232 | 499,966 | 358,423
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 | Field and Emergency Response 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 | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 49,381 | 40,453 | 93,769 | 79,431
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 222,346 | 162,779 | 406,197 | 278,992
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 236,879 | 180,216 | 439,409 | 319,206
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34,848 | 23,016 | 60,557 | 39,217
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79 | 79 | 151 | 158
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79 | 79 | 151 | 158
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 | 79 | 79 | 151 | 158
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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