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REVENUES (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 843,181 | $ 755,846 | $ 2,442,099 | $ 2,197,575
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 718,223 | 625,746 | 2,064,531 | 1,835,828
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 124,958 | 130,100 | 377,568 | 361,747
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 264,769 | 246,323 | 758,081 | 731,028
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 77,025 | 76,446 | 223,052 | 208,172
Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 134,323 | 90,894 | 399,132 | 265,695
Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 33,163 | 27,155 | 89,300 | 81,795
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 200,681 | 191,420 | 594,876 | 575,964
Kleen Performance Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 133,220 | 123,608 | 377,658 | 334,921
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 508,813 | 440,163 | 1,468,417 | 1,285,701
Environmental Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 410,792 | 334,625 | 1,162,891 | 991,731
Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 98,021 | 105,538 | 305,526 | 293,970
Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 264,769 | 246,323 | 758,081 | 731,028
Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 77,025 | 76,446 | 223,052 | 208,172
Environmental Services | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 134,323 | 90,894 | 399,132 | 265,695
Environmental Services | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 32,696 | 26,500 | 88,152 | 80,806
Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Environmental Services | Kleen Performance Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 333,901 | 315,028 | 972,534 | 910,885
Safety-Kleen | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 307,497 | 290,653 | 901,198 | 843,341
Safety-Kleen | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 26,404 | 24,375 | 71,336 | 67,544
Safety-Kleen | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Safety-Kleen | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Safety-Kleen | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Safety-Kleen | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Safety-Kleen | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 200,681 | 191,420 | 594,876 | 575,964
Safety-Kleen | Kleen Performance Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 133,220 | 123,608 | 377,658 | 334,921
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 467 | 655 | 1,148 | 989
Corporate | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | (66) | 468 | 442 | 756
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 533 | 187 | 706 | 233
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 467 | 655 | 1,148 | 989
Corporate | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | Kleen Performance Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 0 | $ 0 | $ 0 | $ 0

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