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SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,602,453 | $ 1,611,827
Goodwill | 472,819 | 465,154
Permits and other intangibles, net | 482,828 | 498,721
Total assets | 3,806,282 | 3,681,920
Technical Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 512,058 | 521,134
Goodwill | 59,973 | 61,116
Permits and other intangibles, net | 76,022 | 78,625
Total assets | 851,852 | 862,957
Industrial and Field Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 243,195 | 245,143
Goodwill | 108,583 | 107,968
Permits and other intangibles, net | 17,135 | 17,817
Total assets | 457,253 | 446,826
Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 590,282 | 584,647
Goodwill | 304,263 | 296,070
Permits and other intangibles, net | 381,020 | 391,390
Total assets | 1,477,660 | 1,474,755
Oil, Gas and Lodging Services |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 181,001 | 182,038
Goodwill | 0 | 0
Permits and other intangibles, net | 8,651 | 10,889
Total assets | 246,195 | 253,242
Corporate Items |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 75,917 | 78,865
Goodwill | 0 | 0
Permits and other intangibles, net | 0 | 0
Total assets | $ 773,322 | $ 644,140

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