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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,397,900 | $ 1,356,312 | $ 2,705,287 | $ 2,525,421
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 389,908 | 387,019 | 756,417 | 710,675
Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 399,661 | 360,949 | 736,147 | 669,859
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 154,359 | 144,860 | 302,445 | 277,219
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 280,122 | 241,138 | 539,689 | 461,471
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 173,850 | 222,346 | 370,589 | 406,197
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,254,849 | 1,182,537 | 2,435,311 | 2,219,817
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 143,051 | 173,775 | 269,976 | 305,604
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,172,036 | 1,090,743 | 2,242,777 | 2,038,188
Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 225,748 | 265,490 | 462,287 | 487,082
Operating Segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,161,482 | 1,084,506 | 2,222,464 | 2,025,304
Operating Segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 389,908 | 387,019 | 756,417 | 710,675
Operating Segments | Environmental Services | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 399,545 | 360,870 | 735,924 | 669,708
Operating Segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 154,359 | 144,860 | 302,445 | 277,219
Operating Segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 217,670 | 191,757 | 427,678 | 367,702
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 | 1,041,739 | 945,579 | 2,000,323 | 1,780,257
Operating Segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 119,743 | 138,927 | 222,141 | 245,047
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 236,302 | 271,727 | 482,600 | 499,966
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 | Industrial Services and Other |  |  |  |
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 | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 62,452 | 49,381 | 112,011 | 93,769
Operating Segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 173,850 | 222,346 | 370,589 | 406,197
Operating Segments | Safety-Kleen Sustainability Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 212,994 | 236,879 | 434,765 | 439,409
Operating Segments | Safety-Kleen Sustainability Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,308 | 34,848 | 47,835 | 60,557
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 116 | 79 | 223 | 151
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 116 | 79 | 223 | 151
Corporate | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
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 | 116 | 79 | 223 | 151
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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