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SEGMENT REPORTING - Schedule of Certain Assets by Reportable Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,531,289 | $ 1,525,298
Goodwill | 544,639 | 527,023
Permits and other intangibles, net | 374,230 | 386,620
Goodwill and Permits and other intangibles, net | 918,869 | 913,643
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 403,136 | 401,918
Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 141,503 | 125,105
Operating Segments [Member] | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 1,068,270 | 1,068,910
Goodwill | 403,136 | 401,918
Permits and other intangibles, net | 221,437 | 228,237
Goodwill and Permits and other intangibles, net | 624,573 | 630,155
Operating Segments [Member] | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 371,056 | 366,160
Goodwill | 141,503 | 125,105
Permits and other intangibles, net | 152,793 | 158,383
Goodwill and Permits and other intangibles, net | 294,296 | 283,488
Corporate, non-Segment |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 91,963 | $ 90,228

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