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REVENUES (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 749,778 | $ 688,941
United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 631,759 | 585,987
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 118,019 | 102,954
Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 236,306 | 230,218
Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 69,935 | 61,019
Industrial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 103,763 | 75,068
Oil, Gas and Lodging Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 29,856 | 29,735
Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 194,161 | 191,727
Kleen Performance Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 115,757 | 101,174
Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 439,688 | 395,907
Environmental Services | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 343,972 | 313,783
Environmental Services | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 95,716 | 82,124
Environmental Services | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 236,306 | 230,218
Environmental Services | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 69,935 | 61,019
Environmental Services | Industrial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 103,763 | 75,068
Environmental Services | Oil, Gas and Lodging Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 29,684 | 29,602
Environmental Services | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Environmental Services | Kleen Performance Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Safety-Kleen |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 309,918 | 292,901
Safety-Kleen | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 287,642 | 272,071
Safety-Kleen | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 22,276 | 20,830
Safety-Kleen | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Safety-Kleen | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Safety-Kleen | Industrial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Safety-Kleen | Oil, Gas and Lodging Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Safety-Kleen | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 194,161 | 191,727
Safety-Kleen | Kleen Performance Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 115,757 | 101,174
Corporate Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 172 | 133
Corporate Segment [Member] | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 145 | 133
Corporate Segment [Member] | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 27 | 0
Corporate Segment [Member] | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Industrial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Oil, Gas and Lodging Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 172 | 133
Corporate Segment [Member] | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Kleen Performance Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0 | $ 0

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