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SEGMENT REPORTING (Segment Information, Revenues, EBITA, and Reconciliation to the Consolidated Statement of Operations) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) operation segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reporting segments number | segment |  |  |  |  |  |  |  |  | 6 |  |
Number of operations for which the revenues are insignificant | operation |  |  |  |  |  |  |  |  | 2 |  |
Total revenues | $ 747,403 | $ 755,846 | $ 752,788 | $ 688,941 | $ 692,113 | $ 729,520 | $ 697,510 | $ 636,083 | $ 2,944,978 | $ 2,755,226 | $ 3,275,137
Adjusted EBITDA |  |  |  |  |  |  |  |  | 425,657 | 400,354 | 504,167
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Accretion of environmental liabilities |  |  |  |  |  |  |  |  | 9,460 | 10,177 | 10,402
Depreciation and amortization |  |  |  |  |  |  |  |  | 288,422 | 287,002 | 274,194
Goodwill impairment charges |  |  |  |  |  | 34,000 |  |  | 0 | 34,013 | 31,992
Income (loss) from operations | 27,935 | 47,663 | 46,744 | 5,433 | 21,943 | 16,802 | 34,504 | (4,087) | 127,775 | 69,162 | 187,579
Other expense (income), net | $ 3,305 | 432 | 833 | $ 1,549 | $ (6,932) | 198 | $ 189 | $ 350 | 6,119 | (6,195) | 1,380
Loss on early extinguishment of debt |  | $ 1,900 | 6,000 |  |  |  |  |  | 7,891 | 0 | 0
Gain on sale of businesses |  |  | $ (31,700) |  |  | $ (16,400) |  |  | (30,732) | (16,884) | 0
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 85,808 | 83,525 | 76,553
Income (loss) before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 58,689 | 8,716 | 109,646
Technical Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,144,149 | 1,056,735 | 1,139,080
Adjusted EBITDA |  |  |  |  |  |  |  |  | 276,592 | 271,176 | 291,737
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  |  |  |  |  | 0 |
Industrial and Field Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 593,722 | 582,215 | 989,953
Adjusted EBITDA |  |  |  |  |  |  |  |  | 43,010 | 51,191 | 161,447
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  |  |  |  |  | 0 |
Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,087,886 | 996,083 | 941,689
Adjusted EBITDA |  |  |  |  |  |  |  |  | 249,811 | 219,546 | 172,262
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  |  |  |  |  | 0 |
Oil, Gas and Lodging Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 119,603 | 119,883 | 207,139
Adjusted EBITDA |  |  |  |  |  |  |  |  | 1,708 | (3,292) | 11,704
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  |  |  |  |  | 34,013 |
Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (382) | 310 | (2,724)
Adjusted EBITDA |  |  |  |  |  |  |  |  | (145,464) | (138,267) | (132,983)
Direct revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,944,978 | 2,755,226 | 3,275,137
Direct revenues | Technical Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 980,232 | 906,495 | 991,410
Direct revenues | Industrial and Field Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 631,216 | 618,245 | 1,023,638
Direct revenues | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,213,703 | 1,110,727 | 1,060,926
Direct revenues | Oil, Gas and Lodging Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 117,252 | 116,692 | 198,705
Direct revenues | Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,575 | 3,067 | 458
Intersegment revenues, net | Technical Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 161,533 | 147,866 | 144,084
Intersegment revenues, net | Industrial and Field Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (37,694) | (35,724) | (32,903)
Intersegment revenues, net | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (125,822) | (115,013) | (119,232)
Intersegment revenues, net | Oil, Gas and Lodging Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,983 | 2,871 | 8,051
Intersegment revenues, net | Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Corporate Items, net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Corporate Items, net | Technical Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,384 | 2,374 | 3,586
Corporate Items, net | Industrial and Field Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 200 | (306) | (782)
Corporate Items, net | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 5 | 369 | (5)
Corporate Items, net | Oil, Gas and Lodging Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 368 | 320 | 383
Corporate Items, net | Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (2,957) | $ (2,757) | $ (3,182)

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