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SEGMENT REPORTING - Assets by Reportable Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,547,119 | $ 1,588,151
Goodwill | 519,627 | 525,013
Permits and other intangibles, net | 406,881 | 419,066
Goodwill and permits and other intangibles, net | 926,508 | 944,079
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 209,713 | 212,531
Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 309,914 | 312,482
Operating segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 909,207 | 939,352
Goodwill | 209,713 | 212,531
Permits and other intangibles, net | 85,165 | 89,722
Goodwill and permits and other intangibles, net | 294,878 | 302,253
Operating segments | Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 552,879 | 555,310
Goodwill | 309,914 | 312,482
Permits and other intangibles, net | 321,716 | 329,344
Goodwill and permits and other intangibles, net | 631,630 | 641,826
Corporate Items |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 85,033 | $ 93,489

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