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SEGMENT REPORTING - Schedule of Certain Assets by Reportable Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,508,356 | $ 1,525,298
Goodwill | 543,028 | 527,023
Permits and other intangibles, net | 366,497 | 386,620
Goodwill and Permits and other intangibles, net | 909,525 | 913,643
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 402,025 | 401,918
Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 141,003 | 125,105
Operating Segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 1,050,901 | 1,068,910
Goodwill | 402,025 | 401,918
Permits and other intangibles, net | 217,188 | 228,237
Goodwill and Permits and other intangibles, net | 619,213 | 630,155
Operating Segments | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 363,857 | 366,160
Goodwill | 141,003 | 125,105
Permits and other intangibles, net | 149,309 | 158,383
Goodwill and Permits and other intangibles, net | 290,312 | 283,488
Corporate, non-Segment |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 93,598 | $ 90,228

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