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REVENUES (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 808,148 | $ 858,563
Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 272,040 | 275,273
Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 105,168 | 105,912
Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 119,889 | 147,009
Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 194,838 | 214,481
Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 116,213 | 115,888
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 714,577 | 746,245
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 93,571 | 112,318
Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 654,602 | 705,192
Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 153,467 | 153,281
Operating segments | Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 652,878 | 705,036
Operating segments | Environmental Services | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 272,040 | 275,273
Operating segments | Environmental Services | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 105,168 | 105,912
Operating segments | Environmental Services | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 119,810 | 146,919
Operating segments | Environmental Services | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 155,860 | 176,932
Operating segments | Environmental Services | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Environmental Services | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 575,508 | 607,110
Operating segments | Environmental Services | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 77,370 | 97,926
Operating segments | Safety-Kleen Sustainability Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 155,191 | 153,437
Operating segments | Safety-Kleen Sustainability Solutions | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 38,978 | 37,549
Operating segments | Safety-Kleen Sustainability Solutions | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 116,213 | 115,888
Operating segments | Safety-Kleen Sustainability Solutions | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 138,990 | 139,437
Operating segments | Safety-Kleen Sustainability Solutions | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 16,201 | 14,000
Corporate, non-Segment |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 79 | 90
Corporate, non-Segment | Technical Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate, non-Segment | Field and Emergency Response Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate, non-Segment | Industrial Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 79 | 90
Corporate, non-Segment | Safety-Kleen Environmental Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate, non-Segment | Safety-Kleen Oil |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Corporate, non-Segment | United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 79 | (302)
Corporate, non-Segment | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 0 | $ 392

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