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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 1,169,109 | $ 808,148
Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 323,656 | 272,040
Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 132,359 | 105,168
Field and Emergency Response Services | HydroChemPSC |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 28,000 |
Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 308,910 | 119,889
Industrial Services and Other | HydroChemPSC |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 156,100 |
Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 220,333 | 194,838
Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 183,851 | 116,213
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,037,280 | 714,577
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 131,829 | 93,571
Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 947,445 | 654,602
Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 221,592 | 153,467
Operating segments | Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 940,798 | 652,878
Operating segments | Environmental Services | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 323,656 | 272,040
Operating segments | Environmental Services | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 132,359 | 105,168
Operating segments | Environmental Services | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 308,838 | 119,810
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 175,945 | 155,860
Operating segments | Environmental Services | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Environmental Services | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 834,678 | 575,508
Operating segments | Environmental Services | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 106,120 | 77,370
Operating segments | Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 228,239 | 155,191
Operating segments | Safety-Kleen Sustainability Solutions | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 44,388 | 38,978
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 183,851 | 116,213
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 202,530 | 138,990
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 25,709 | 16,201
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 72 | 79
Corporate | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 72 | 79
Corporate | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 72 | 79
Corporate | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 0 | $ 0

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