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REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 779,344 | $ 891,668 | $ 2,347,907 | $ 2,541,185
Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 257,612 | 292,506 | 774,814 | 820,333
Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 115,989 | 95,546 | 349,254 | 253,894
Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 124,654 | 162,199 | 366,791 | 476,812
Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 203,455 | 217,439 | 612,808 | 640,956
Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 77,634 | 123,978 | 244,240 | 349,190
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 666,649 | 764,352 | 2,044,523 | 2,188,327
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 112,695 | 127,316 | 303,384 | 352,858
Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 527,970 | 586,872 | 1,591,246 | 1,658,970
Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 251,640 | 306,145 | 759,408 | 884,606
Operating segments | Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 498,183 | 550,122 | 1,490,641 | 1,550,114
Operating segments | Environmental Services | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 257,612 | 292,506 | 774,814 | 820,333
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 115,989 | 95,546 | 349,254 | 253,894
Operating segments | Environmental Services | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 124,582 | 162,070 | 366,573 | 475,887
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating segments | Environmental Services | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating segments | Environmental Services | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 30,200 |  | 91,900
Operating segments | Environmental Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 409,787 | 450,638 | 1,253,252 | 1,270,556
Operating segments | Environmental Services | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 88,396 | 99,484 | 237,389 | 279,558
Operating segments | Safety-Kleen |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 281,089 | 341,417 | 857,048 | 990,146
Operating segments | Safety-Kleen | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating segments | Safety-Kleen | Safety-Kleen Environmental Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 203,455 | 217,439 | 612,808 | 640,956
Operating segments | Safety-Kleen | Safety-Kleen Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 77,634 | 123,978 | 244,240 | 349,190
Operating segments | Safety-Kleen | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 257,048 | 313,979 | 791,919 | 917,240
Operating segments | Safety-Kleen | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,041 | 27,438 | 65,129 | 72,906
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 72 | 129 | 218 | 925
Corporate | Technical Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Field and Emergency Response Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate | Industrial Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 72 | 129 | 218 | 925
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 | Oil, Gas and Lodging Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 100 |  | 900
Corporate | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (186) | (265) | (648) | 531
Corporate | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 258 | $ 394 | $ 866 | $ 394

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