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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to Goodwill | The changes in goodwill for the years ended December 31, 2017 and 2016 were as follows (in thousands):
| Technical Services |  | Industrial and Field Services |  | Safety-Kleen |  | Oil, Gas and Lodging Services |  | Totals
Balance at January 1, 2016 | $ | 49,267 |  |  | $ | 105,286 |  |  | $ | 266,344 |  |  | $ | 32,208 |  |  | $ | 453,105 |
Increase from current period acquisitions | 12,572 |  |  | 6,953 |  |  | 26,266 |  |  | — |  |  | 45,791 |
Measurement period adjustments from prior period acquisitions | — |  |  | — |  |  | 2,095 |  |  | — |  |  | 2,095 |
Decrease from disposition of business | — |  |  | (4,994 | ) |  | — |  |  | — |  |  | (4,994 | )
Goodwill impairment charge | — |  |  | — |  |  | — |  |  | (34,013 | ) |  | (34,013 | )
Foreign currency translation | (723 | ) |  | 723 |  |  | 1,365 |  |  | 1,805 |  |  | 3,170 |
Balance at December 31, 2016 | $ | 61,116 |  |  | $ | 107,968 |  |  | $ | 296,070 |  |  | $ | — |  |  | $ | 465,154 |
Increase from current period acquisitions | — |  |  | 3,000 |  |  | 5,687 |  |  | — |  |  | 8,687 |
Measurement period adjustments from prior period acquisitions | — |  |  | — |  |  | 2,186 |  |  | — |  |  | 2,186 |
Decrease from disposition of business | (1,300 | ) |  | — |  |  | — |  |  | — |  |  | (1,300 | )
Foreign currency translation | 317 |  |  | 1,285 |  |  | 2,194 |  |  | — |  |  | 3,796 |
Balance at December 31, 2017 | $ | 60,133 |  |  | $ | 112,253 |  |  | $ | 306,137 |  |  | $ | — |  |  | $ | 478,523 |
Schedule of Finite-Lived Intangible Assets by Major Class | As of December 31, 2017 and 2016, the Company's finite-lived and indefinite lived intangible assets consisted of the following (in thousands):
| December 31, 2017 |  | December 31, 2016
| Cost |  | Accumulated Amortization |  | Net |  |  | Cost |  | Accumulated Amortization |  | Net |
Permits | $ | 174,721 |  |  | $ | 74,347 |  |  | $ | 100,374 |  |  |  | $ | 171,637 |  |  | $ | 67,301 |  |  | $ | 104,336 |  |
Customer and supplier relationships | 399,224 |  |  | 158,972 |  |  | 240,252 |  |  |  | 393,426 |  |  | 127,462 |  |  | 265,964 |  |
Other intangible assets | 36,766 |  |  | 31,592 |  |  | 5,174 |  |  |  | 34,254 |  |  | 28,456 |  |  | 5,798 |  |
Total amortizable permits and other intangible assets | 610,711 |  |  | 264,911 |  |  | 345,800 |  |  |  | 599,317 |  |  | 223,219 |  |  | 376,098 |  |
Trademarks and trade names | 123,328 |  |  | — |  |  | 123,328 |  |  |  | 122,623 |  |  | — |  |  | 122,623 |  |
Total permits and other intangible assets | $ | 734,039 |  |  | $ | 264,911 |  |  | $ | 469,128 |  |  |  | $ | 721,940 |  |  | $ | 223,219 |  |  | $ | 498,721 |  |
Schedule of Indefinite-Lived Intangible Assets | As of December 31, 2017 and 2016, the Company's finite-lived and indefinite lived intangible assets consisted of the following (in thousands):
| December 31, 2017 |  | December 31, 2016
| Cost |  | Accumulated Amortization |  | Net |  |  | Cost |  | Accumulated Amortization |  | Net |
Permits | $ | 174,721 |  |  | $ | 74,347 |  |  | $ | 100,374 |  |  |  | $ | 171,637 |  |  | $ | 67,301 |  |  | $ | 104,336 |  |
Customer and supplier relationships | 399,224 |  |  | 158,972 |  |  | 240,252 |  |  |  | 393,426 |  |  | 127,462 |  |  | 265,964 |  |
Other intangible assets | 36,766 |  |  | 31,592 |  |  | 5,174 |  |  |  | 34,254 |  |  | 28,456 |  |  | 5,798 |  |
Total amortizable permits and other intangible assets | 610,711 |  |  | 264,911 |  |  | 345,800 |  |  |  | 599,317 |  |  | 223,219 |  |  | 376,098 |  |
Trademarks and trade names | 123,328 |  |  | — |  |  | 123,328 |  |  |  | 122,623 |  |  | — |  |  | 122,623 |  |
Total permits and other intangible assets | $ | 734,039 |  |  | $ | 264,911 |  |  | $ | 469,128 |  |  |  | $ | 721,940 |  |  | $ | 223,219 |  |  | $ | 498,721 |  |
Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets | The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2017 is as follows (in thousands):
Years Ending December 31, | Expected Amortization
2018 | $ | 34,631 |
2019 | 31,684 |
2020 | 29,130 |
2021 | 26,888 |
2022 | 26,727 |
Thereafter | 196,740 |
| $ | 345,800 |

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