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SEGMENT REPORTING - Assets by Reportable Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,593,993 | $ 1,561,978
Goodwill | 524,581 | 514,189
Permits and other intangibles, net | 425,863 | 441,875
Intangible Assets, Net (Including Goodwill) | 950,444 | 956,064
Total assets | 4,021,862 | 3,738,321
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 212,638 | 207,019
Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 311,943 | 307,170
Operating segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 946,367 | 951,867
Goodwill | 212,638 | 207,019
Permits and other intangibles, net | 91,292 | 93,313
Intangible Assets, Net (Including Goodwill) | 303,930 | 300,332
Total assets | 1,750,343 | 1,640,706
Operating segments | Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 556,247 | 553,220
Goodwill | 311,943 | 307,170
Permits and other intangibles, net | 334,571 | 348,562
Intangible Assets, Net (Including Goodwill) | 646,514 | 655,732
Total assets | 1,501,838 | 1,431,381
Corporate Items |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 91,379 | 56,891
Total assets | $ 769,681 | $ 666,234

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