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SEGMENT REPORTING (Segment Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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
Property, plant and equipment, net | 1,587,365 |  |  |  | 1,611,827 |  |  |  | 1,587,365 | 1,611,827 |
Permits and other intangibles, net | 469,128 |  |  |  | 498,721 |  |  |  | 469,128 | 498,721 |
Goodwill | 478,523 |  |  |  | 465,154 |  |  |  | 478,523 | 465,154 | 453,105
Goodwill and Permits and other intangibles, net | 947,651 |  |  |  | 963,875 |  |  |  | 947,651 | 963,875 |
Assets | 3,706,570 |  |  |  | 3,681,920 |  |  |  | 3,706,570 | 3,681,920 | 3,431,428
Technical Services |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,144,149 | 1,056,735 | 1,139,080
Property, plant and equipment, net | 504,754 |  |  |  | 521,134 |  |  |  | 504,754 | 521,134 |
Permits and other intangibles, net | 73,775 |  |  |  | 78,625 |  |  |  | 73,775 | 78,625 |
Goodwill | 60,133 |  |  |  | 61,116 |  |  |  | 60,133 | 61,116 | 49,267
Goodwill and Permits and other intangibles, net | 133,908 |  |  |  | 139,741 |  |  |  | 133,908 | 139,741 |
Assets | 847,994 |  |  |  | 862,957 |  |  |  | 847,994 | 862,957 | 800,060
Industrial and Field Services |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 593,722 | 582,215 | 989,953
Property, plant and equipment, net | 254,091 |  |  |  | 245,143 |  |  |  | 254,091 | 245,143 |
Permits and other intangibles, net | 17,049 |  |  |  | 17,817 |  |  |  | 17,049 | 17,817 |
Goodwill | 112,253 |  |  |  | 107,968 |  |  |  | 112,253 | 107,968 | 105,286
Goodwill and Permits and other intangibles, net | 129,302 |  |  |  | 125,785 |  |  |  | 129,302 | 125,785 |
Assets | 464,142 |  |  |  | 446,826 |  |  |  | 464,142 | 446,826 | 461,180
Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,087,886 | 996,083 | 941,689
Property, plant and equipment, net | 582,162 |  |  |  | 584,647 |  |  |  | 582,162 | 584,647 |
Permits and other intangibles, net | 371,609 |  |  |  | 391,390 |  |  |  | 371,609 | 391,390 |
Goodwill | 306,137 |  |  |  | 296,070 |  |  |  | 306,137 | 296,070 | 266,344
Goodwill and Permits and other intangibles, net | 677,746 |  |  |  | 687,460 |  |  |  | 677,746 | 687,460 |
Assets | 1,471,291 |  |  |  | 1,474,755 |  |  |  | 1,471,291 | 1,474,755 | 1,297,971
Oil, Gas and Lodging Services |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 119,603 | 119,883 | 207,139
Property, plant and equipment, net | 168,294 |  |  |  | 182,038 |  |  |  | 168,294 | 182,038 |
Permits and other intangibles, net | 6,695 |  |  |  | 10,889 |  |  |  | 6,695 | 10,889 |
Goodwill | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 32,208
Goodwill and Permits and other intangibles, net | 6,695 |  |  |  | 10,889 |  |  |  | 6,695 | 10,889 |
Assets | 229,105 |  |  |  | 253,242 |  |  |  | 229,105 | 253,242 | 333,245
Corporate Items |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 78,064 |  |  |  | 78,865 |  |  |  | 78,064 | 78,865 |
Assets | 694,038 |  |  |  | 644,140 |  |  |  | 694,038 | 644,140 | 538,972
United States and Puerto Rico |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 2,392,000 | $ 2,213,400 | $ 2,576,200
Percent of revenues |  |  |  |  |  |  |  |  | 81.20% | 80.30% | 78.70%
United States |  |  |  |  |  |  |  |  |  |  |
Assets | 2,985,394 |  |  |  | 2,960,337 |  |  |  | $ 2,985,394 | $ 2,960,337 | $ 2,575,746
Canada |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 552,100 | $ 538,000 | $ 695,000
Percent of revenues |  |  |  |  |  |  |  |  | 18.70% | 19.50% | 21.20%
Property, plant and equipment, net | $ 411,900 |  |  |  | $ 400,300 |  |  |  | $ 411,900 | $ 400,300 |
Percent of property, plant and equipment, net | 26.00% |  |  |  | 24.80% |  |  |  | 26.00% | 24.80% |
Permits and other intangibles, net | $ 60,500 |  |  |  | $ 63,100 |  |  |  | $ 60,500 | $ 63,100 |
Percent of permits and other intangibles, net | 12.90% |  |  |  | 12.70% |  |  |  | 12.90% | 12.70% |
Assets | $ 721,176 |  |  |  | $ 721,583 |  |  |  | $ 721,176 | $ 721,583 | $ 851,949
Other foreign |  |  |  |  |  |  |  |  |  |  |
Percent of revenues |  |  |  |  |  |  |  |  | 0.10% |  | 0.10%
Assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 3,733

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