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REVENUES (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 3,144,097 | $ 3,412,190 | $ 3,300,303
Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,062,714 | 1,120,043 | 1,037,388
Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 461,036 | 340,906 | 304,727
Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 480,621 | 632,550 | 662,833
Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 809,236 | 851,520 | 795,077
Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 330,490 | 467,171 | 500,278
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,739,557 | 2,940,832 | 2,796,145
Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 404,540 | 471,358 | 504,158
Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,137,306 | 2,237,068 | 2,141,194
Safety-Kleen |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,010,202 | 1,178,129 | 1,161,282
Operating segments | Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,004,081 | 2,092,363 | 2,003,843
Operating segments | Environmental Services | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,062,714 | 1,120,043 | 1,037,388
Operating segments | Environmental Services | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 461,036 | 340,906 | 304,727
Operating segments | Environmental Services | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 480,331 | 631,414 | 661,728
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Environmental Services | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Environmental Services | Oil, Gas and Lodging Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 117,000 | 119,800
Operating segments | Environmental Services | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,690,256 | 1,721,322 | 1,598,402
Operating segments | Environmental Services | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 313,825 | 371,041 | 405,441
Operating segments | Safety-Kleen |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,139,726 | 1,318,691 | 1,295,355
Operating segments | Safety-Kleen | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating segments | Safety-Kleen | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 809,236 | 851,520 | 795,077
Operating segments | Safety-Kleen | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 330,490 | 467,171 | 500,278
Operating segments | Safety-Kleen | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,049,975 | 1,220,096 | 1,196,661
Operating segments | Safety-Kleen | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 89,751 | 98,595 | 98,694
Corporate, non-segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 290 | 1,136 | 1,105
Corporate, non-segment | Technical Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Field and Emergency Response Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Industrial Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 290 | 1,136 | 1,105
Corporate, non-segment | Safety-Kleen Environmental Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Safety-Kleen Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Corporate, non-segment | Oil, Gas and Lodging Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 1,100 | 1,100
Corporate, non-segment | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (674) | (586) | 1,082
Corporate, non-segment | Canada |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 964 | $ 1,722 | $ 23

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