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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 926,458 | $ 710,000 | $ 1,734,606 | $ 1,568,563
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 306,865 | 241,929 | 578,905 | 517,202
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 106,986 | 127,353 | 212,154 | 233,265
Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 150,446 | 95,128 | 270,335 | 242,137
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 199,382 | 194,872 | 394,220 | 409,353
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 162,779 | 50,718 | 278,992 | 166,606
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 796,880 | 631,629 | 1,511,457 | 1,377,874
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 129,578 | 78,371 | 223,149 | 190,689
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 724,097 | 612,594 | 1,378,699 | 1,317,786
Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 202,282 | 97,350 | 355,749 | 250,631
Operating segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 723,147 | 612,720 | 1,376,025 | 1,317,756
Operating segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 306,865 | 241,929 | 578,905 | 517,202
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 106,986 | 127,353 | 212,154 | 233,265
Operating segments | Environmental Services | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 150,367 | 95,072 | 270,177 | 241,991
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 158,929 | 148,366 | 314,789 | 325,298
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 | 616,585 | 543,785 | 1,192,093 | 1,150,895
Operating segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 106,562 | 68,935 | 183,932 | 166,861
Operating segments | Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 203,232 | 97,224 | 358,423 | 250,661
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 | 40,453 | 46,506 | 79,431 | 84,055
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 162,779 | 50,718 | 278,992 | 166,606
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 180,216 | 88,004 | 319,206 | 227,441
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,016 | 9,220 | 39,217 | 23,220
Corporate, non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79 | 56 | 158 | 146
Corporate, non-Segment | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate, non-Segment | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate, non-Segment | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79 | 56 | 158 | 146
Corporate, non-Segment | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate, non-Segment | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate, non-Segment | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79 | (160) | 158 | (462)
Corporate, non-Segment | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 216 | $ 0 | $ 608

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