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SEGMENT REPORTING (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Reconciliation of Third Party Revenues to Direct Revenues | The following table reconciles third-party revenues to direct revenues for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| For the Year Ended December 31, 2017
| Technical Services |  | Industrial and Field Services |  | Safety-Kleen |  | Oil, Gas and Lodging Services |  | Corporate Items |  | Totals
Third-party revenues | $ | 980,232 |  |  | $ | 631,216 |  |  | $ | 1,213,703 |  |  | $ | 117,252 |  |  | $ | 2,575 |  |  | $ | 2,944,978 |
Intersegment revenues, net | 161,533 |  |  | (37,694 | ) |  | (125,822 | ) |  | 1,983 |  |  | — |  |  | — |
Corporate Items, net | 2,384 |  |  | 200 |  |  | 5 |  |  | 368 |  |  | (2,957 | ) |  | — |
Direct revenues | $ | 1,144,149 |  |  | $ | 593,722 |  |  | $ | 1,087,886 |  |  | $ | 119,603 |  |  | $ | (382 | ) |  | $ | 2,944,978 |
| For the Year Ended December 31, 2016
| Technical Services |  | Industrial and Field Services |  | Safety-Kleen |  | Oil, Gas and Lodging Services |  | Corporate Items |  | Totals
Third-party revenues | $ | 906,495 |  |  | $ | 618,245 |  |  | $ | 1,110,727 |  |  | $ | 116,692 |  |  | $ | 3,067 |  |  | $ | 2,755,226 |
Intersegment revenues, net | 147,866 |  |  | (35,724 | ) |  | (115,013 | ) |  | 2,871 |  |  | — |  |  | — |
Corporate Items, net | 2,374 |  |  | (306 | ) |  | 369 |  |  | 320 |  |  | (2,757 | ) |  | — |
Direct revenues | $ | 1,056,735 |  |  | $ | 582,215 |  |  | $ | 996,083 |  |  | $ | 119,883 |  |  | $ | 310 |  |  | $ | 2,755,226 |
| For the Year Ended December 31, 2015
| Technical Services |  | Industrial and Field Services |  | Safety-Kleen |  | Oil, Gas and Lodging Services |  | Corporate Items |  | Totals
Third-party revenues | $ | 991,410 |  |  | $ | 1,023,638 |  |  | $ | 1,060,926 |  |  | $ | 198,705 |  |  | $ | 458 |  |  | $ | 3,275,137 |
Intersegment revenues, net | 144,084 |  |  | (32,903 | ) |  | (119,232 | ) |  | 8,051 |  |  | — |  |  | — |
Corporate Items, net | 3,586 |  |  | (782 | ) |  | (5 | ) |  | 383 |  |  | (3,182 | ) |  | — |
Direct revenues | $ | 1,139,080 |  |  | $ | 989,953 |  |  | $ | 941,689 |  |  | $ | 207,139 |  |  | $ | (2,724 | ) |  | $ | 3,275,137 |
Reconciliation to Consolidated Statements of Income to Adjusted EBITDA | The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Adjusted EBITDA: |  |  |  |  |
Technical Services | $ | 276,592 |  |  | $ | 271,176 |  |  | $ | 291,737 |
Industrial and Field Services | 43,010 |  |  | 51,191 |  |  | 161,447 |
Safety-Kleen | 249,811 |  |  | 219,546 |  |  | 172,262 |
Oil, Gas and Lodging Services | 1,708 |  |  | (3,292 | ) |  | 11,704 |
Corporate Items | (145,464 | ) |  | (138,267 | ) |  | (132,983 | )
Total | 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 | — |  |  | 34,013 |  |  | 31,992 |
Income from operations | 127,775 |  |  | 69,162 |  |  | 187,579 |
Other expense (income), net | 6,119 |  |  | (6,195 | ) |  | 1,380 |
Loss on early extinguishment of debt | 7,891 |  |  | — |  |  | — |
Gain on sale of businesses | (30,732 | ) |  | (16,884 | ) |  | — |
Interest expense, net of interest income | 85,808 |  |  | 83,525 |  |  | 76,553 |
Income from operations before (benefit) provision for income taxes | $ | 58,689 |  |  | $ | 8,716 |  |  | $ | 109,646 |
PP&E and Intangible Assets by Segment | The following table presents assets by reported segment and in the aggregate (in thousands):
| December 31, 2017 |  | December 31, 2016
Property, plant and equipment, net |  |  |
Technical Services | $ | 504,754 |  |  | $ | 521,134 |
Industrial and Field Services | 254,091 |  |  | 245,143 |
Safety-Kleen | 582,162 |  |  | 584,647 |
Oil, Gas and Lodging Services | 168,294 |  |  | 182,038 |
Corporate Items | 78,064 |  |  | 78,865 |
Total property, plant and equipment, net | $ | 1,587,365 |  |  | $ | 1,611,827 |
Goodwill and Permits and other intangibles, net |  |  |
Technical Services |  |  |
Goodwill | $ | 60,133 |  |  | $ | 61,116 |
Permits and other intangibles, net | 73,775 |  |  | 78,625 |
Total Technical Services | 133,908 |  |  | 139,741 |
Industrial and Field Services |  |  |
Goodwill | 112,253 |  |  | 107,968 |
Permits and other intangibles, net | 17,049 |  |  | 17,817 |
Total Industrial and Field Services | 129,302 |  |  | 125,785 |
Safety-Kleen |  |  |
Goodwill | 306,137 |  |  | 296,070 |
Permits and other intangibles, net | 371,609 |  |  | 391,390 |
Total Safety-Kleen | 677,746 |  |  | 687,460 |
Oil, Gas and Lodging Services |  |  |
Goodwill | — |  |  | — |
Permits and other intangibles, net | 6,695 |  |  | 10,889 |
Total Oil, Gas and Lodging Services | 6,695 |  |  | 10,889 |
Total | $ | 947,651 |  |  | $ | 963,875 |
Total Assets by Segment | The following table presents the total assets by reported segment (in thousands):
| December 31, 2017 |  | December 31, 2016 |  | December 31, 2015
Technical Services | $ | 847,994 |  |  | $ | 862,957 |  |  | $ | 800,060 |
Industrial and Field Services | 464,142 |  |  | 446,826 |  |  | 461,180 |
Safety-Kleen | 1,471,291 |  |  | 1,474,755 |  |  | 1,297,971 |
Oil, Gas and Lodging Services | 229,105 |  |  | 253,242 |  |  | 333,245 |
Corporate Items | 694,038 |  |  | 644,140 |  |  | 538,972 |
Total | $ | 3,706,570 |  |  | $ | 3,681,920 |  |  | $ | 3,431,428 |
Total Assets by Geographical Area | The following table presents the total assets by geographical area (in thousands):
| December 31, 2017 |  | December 31, 2016 |  | December 31, 2015
United States | $ | 2,985,394 |  |  | $ | 2,960,337 |  |  | $ | 2,575,746 |
Canada | 721,176 |  |  | 721,583 |  |  | 851,949 |
Other foreign | — |  |  | — |  |  | 3,733 |
Total | $ | 3,706,570 |  |  | $ | 3,681,920 |  |  | $ | 3,431,428 |

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