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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 868,678 | $ 849,140 | $ 1,649,517 | $ 1,598,918
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 275,908 | 257,006 | 527,827 | 493,312
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 86,722 | 76,092 | 158,348 | 146,027
Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 136,011 | 161,046 | 252,109 | 264,809
Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 27,855 | 26,281 | 62,504 | 56,137
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 216,434 | 200,034 | 423,517 | 394,195
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 125,748 | 128,681 | 225,212 | 244,438
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 748,639 | 714,549 | 1,423,976 | 1,346,308
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 120,039 | 134,591 | 225,541 | 252,610
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 526,294 | 519,916 | 999,992 | 959,604
Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 275,908 | 257,006 | 527,827 | 493,312
Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 86,722 | 76,092 | 158,348 | 146,027
Environmental Services | Industrial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 136,011 | 161,046 | 252,109 | 264,809
Environmental Services | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 27,653 | 25,772 | 61,708 | 55,456
Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Environmental Services | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Environmental Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 431,749 | 408,127 | 819,918 | 752,099
Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 94,545 | 111,789 | 180,074 | 207,505
Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 342,182 | 328,715 | 648,729 | 638,633
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 | 216,434 | 200,034 | 423,517 | 394,195
Safety-Kleen | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 125,748 | 128,681 | 225,212 | 244,438
Safety-Kleen | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 316,688 | 306,059 | 603,262 | 593,701
Safety-Kleen | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 25,494 | 22,656 | 45,467 | 44,932
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 202 | 509 | 796 | 681
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 | 202 | 509 | 796 | 681
Corporate | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 0 | 0 | 0 | 0
Corporate | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | 202 | 363 | 796 | 508
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total third party revenues | $ 0 | $ 146 | $ 0 | $ 173

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