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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 891,668 | $ 843,181 | $ 2,541,185 | $ 2,442,099
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 292,506 | 264,769 | 820,333 | 758,081
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 95,546 | 77,025 | 253,894 | 223,052
Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 131,855 | 134,323 | 383,964 | 399,132
Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 30,344 | 33,163 | 92,848 | 89,300
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 217,439 | 200,681 | 640,956 | 594,876
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 123,978 | 133,220 | 349,190 | 377,658
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 764,352 | 718,223 | 2,188,327 | 2,064,531
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 127,316 | 124,958 | 352,858 | 377,568
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 586,872 | 542,980 | 1,658,970 | 1,570,241
Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 306,145 | 300,885 | 884,606 | 873,284
Operating segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 550,122 | 508,813 | 1,550,114 | 1,468,417
Operating segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 292,506 | 264,769 | 820,333 | 758,081
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 95,546 | 77,025 | 253,894 | 223,052
Operating segments | Environmental Services | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 131,855 | 134,323 | 383,964 | 399,132
Operating segments | Environmental Services | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 30,215 | 32,696 | 91,923 | 88,152
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Environmental Services | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Environmental Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 450,638 | 410,792 | 1,270,556 | 1,162,891
Operating segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 99,484 | 98,021 | 279,558 | 305,526
Operating segments | Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 341,417 | 333,901 | 990,146 | 972,534
Operating segments | Safety-Kleen | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 217,439 | 200,681 | 640,956 | 594,876
Operating segments | Safety-Kleen | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 123,978 | 133,220 | 349,190 | 377,658
Operating segments | Safety-Kleen | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 313,979 | 307,497 | 917,240 | 901,198
Operating segments | Safety-Kleen | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 27,438 | 26,404 | 72,906 | 71,336
Corporate Items |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 129 | 467 | 925 | 1,148
Corporate Items | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate Items | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate Items | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate Items | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 129 | 467 | 925 | 1,148
Corporate Items | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate Items | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate Items | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | (265) | (66) | 531 | 442
Corporate Items | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 394 | $ 533 | $ 394 | $ 706

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