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SEGMENT REPORTING (Segment Information, Revenues, EBITA, and Reconciliation to the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 858,204 | $ 843,181 | $ 849,140 | $ 749,778 | $ 747,403 | $ 755,846 | $ 752,788 | $ 688,941 | $ 3,300,303 | $ 2,944,978 | $ 2,755,226
Adjusted EBITDA |  |  |  |  |  |  |  |  | 491,005 | 425,657 | 400,354
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Accretion of environmental liabilities |  |  |  |  |  |  |  |  | 9,806 | 9,460 | 10,177
Depreciation and amortization |  |  |  |  |  |  |  |  | 298,625 | 288,422 | 287,002
Goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 0 | 34,013
(Loss) income from operations | 41,485 | 65,745 | 64,353 | 10,991 | 27,935 | 47,663 | 46,744 | 5,433 | 182,574 | 127,775 | 69,162
Other expense (income), net | 4,061 | 996 | $ (846) | $ 299 | 3,305 | 432 | 833 | $ 1,549 | 4,510 | 6,119 | (6,195)
Loss on early extinguishment of debt |  | $ 2,500 |  |  |  | $ 1,900 | 6,000 |  | 2,488 | 7,891 | 0
Gain on sale of businesses |  |  |  |  |  |  | $ (31,700) |  | 0 | (30,732) | (16,884)
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 81,094 | 85,808 | 83,525
(Loss) income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 94,482 | 58,689 | 8,716
Assets | 3,738,321 |  |  |  | 3,706,570 |  |  |  | 3,738,321 | 3,706,570 |
Property, plant and equipment, net | 1,561,978 |  |  |  | 1,587,365 |  |  |  | 1,561,978 | 1,587,365 |
Goodwill | 514,189 |  |  |  | 478,523 |  |  |  | 514,189 | 478,523 | 465,154
Permits and other intangibles, net | 441,875 |  |  |  | 469,128 |  |  |  | 441,875 | 469,128 |
Permits and other intangibles, net | 956,064 |  |  |  | 947,651 |  |  |  | 956,064 | 947,651 |
Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,003,843 | 1,728,700 | 1,641,432
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill | 207,019 |  |  |  | 172,386 |  |  |  | 207,019 | 172,386 | 169,084
Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,295,355 | 1,213,703 | 1,110,727
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill | 307,170 |  |  |  | 306,137 |  |  |  | 307,170 | 306,137 | 296,070
Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,105 | 2,575 | 3,067
Direct revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 3,300,303 | 2,944,978 | 2,755,226
Direct revenues | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,141,194 | 1,857,474 | 1,758,833
Adjusted EBITDA |  |  |  |  |  |  |  |  | 380,856 | 321,310 | 319,075
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Assets | 1,640,706 |  |  |  | 1,541,241 |  |  |  | 1,640,706 | 1,541,241 |
Property, plant and equipment, net | 951,867 |  |  |  | 927,139 |  |  |  | 951,867 | 927,139 |
Goodwill | 207,019 |  |  |  | 172,386 |  |  |  | 207,019 | 172,386 |
Permits and other intangibles, net | 93,313 |  |  |  | 97,519 |  |  |  | 93,313 | 97,519 |
Permits and other intangibles, net | 300,332 |  |  |  | 269,905 |  |  |  | 300,332 | 269,905 |
Direct revenues | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,161,282 | 1,087,886 | 996,083
Adjusted EBITDA |  |  |  |  |  |  |  |  | 282,029 | 249,811 | 219,546
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Assets | 1,431,381 |  |  |  | 1,471,291 |  |  |  | 1,431,381 | 1,471,291 |
Property, plant and equipment, net | 553,220 |  |  |  | 582,162 |  |  |  | 553,220 | 582,162 |
Goodwill | 307,170 |  |  |  | 306,137 |  |  |  | 307,170 | 306,137 |
Permits and other intangibles, net | 348,562 |  |  |  | 371,609 |  |  |  | 348,562 | 371,609 |
Permits and other intangibles, net | 655,732 |  |  |  | 677,746 |  |  |  | 655,732 | 677,746 |
Direct revenues | Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (2,173) | (382) | 310
Intersegment revenues, net | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 134,104 | 125,822 | 115,013
Intersegment revenues, net | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (134,104) | (125,822) | (115,013)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | (171,880) | (145,464) | (138,267)
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Assets | 666,234 |  |  |  | 694,038 |  |  |  | 666,234 | 694,038 |
Property, plant and equipment, net | $ 56,891 |  |  |  | $ 78,064 |  |  |  | 56,891 | 78,064 |
Corporate | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 3,247 | 2,952 | 2,388
Corporate | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 31 | 5 | 369
Corporate | Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (3,278) | $ (2,957) | $ (2,757)

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