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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 1,397,900 | $ 1,356,312 | $ 2,705,287 | $ 2,525,421
Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,172,036 | 1,090,743 | 2,242,777 | 2,038,188
Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 225,748 | 265,490 | 462,287 | 487,082
Operating Segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,161,482 | 1,084,506 | 2,222,464 | 2,025,304
Operating Segments | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 236,302 | 271,727 | 482,600 | 499,966
Intersegment Revenues (Expenses), net | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 10,554 | 6,237 | 20,313 | 12,884
Intersegment Revenues (Expenses), net | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (10,554) | (6,237) | (20,313) | (12,884)
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 116 | $ 79 | $ 223 | $ 151

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