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SEGMENT REPORTING - Assets by Reportable Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,596,917 | $ 1,561,978
Goodwill | 525,044 | 514,189
Permits and other intangibles, net | 433,853 | 441,875
Intangible Assets, Net (Including Goodwill) | 958,897 | 956,064
Total assets | 3,955,321 | 3,738,321
Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 212,808 | 207,019
Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 312,236 | 307,170
Direct revenues | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 956,381 | 951,867
Goodwill | 212,808 | 207,019
Permits and other intangibles, net | 93,303 | 93,313
Intangible Assets, Net (Including Goodwill) | 306,111 | 300,332
Total assets | 1,756,818 | 1,640,706
Direct revenues | Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 559,510 | 553,220
Goodwill | 312,236 | 307,170
Permits and other intangibles, net | 340,550 | 348,562
Intangible Assets, Net (Including Goodwill) | 652,786 | 655,732
Total assets | 1,513,920 | 1,431,381
Corporate Items, net |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 81,026 | 56,891
Total assets | $ 684,583 | $ 666,234

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