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SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 755,846 | $ 729,520 | $ 2,197,575 | $ 2,063,113
Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 755,846 | 729,520 | 2,197,575 | 2,063,113
Technical Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 246,329 | 232,482 | 731,034 | 680,717
Technical Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 41,366 | 38,795 | 121,411 | 109,217
Technical Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 637 | 492 | 1,767 | 1,547
Technical Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 288,332 | 271,769 | 854,212 | 791,481
Industrial and Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 163,808 | 172,191 | 465,264 | 467,019
Industrial and Field Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (10,262) | (10,867) | (27,688) | (25,464)
Industrial and Field Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 45 | (32) | 16 | (348)
Industrial and Field Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 153,591 | 161,292 | 437,592 | 441,207
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 315,028 | 297,082 | 910,885 | 821,758
Safety-Kleen | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (31,757) | (28,716) | (95,465) | (86,329)
Safety-Kleen | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3 | 1 | 4 | 368
Safety-Kleen | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 283,274 | 268,367 | 815,424 | 735,797
Oil, Gas and Lodging Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 30,026 | 27,644 | 89,403 | 91,555
Oil, Gas and Lodging Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 653 | 788 | 1,742 | 2,576
Oil, Gas and Lodging Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 79 | 105 | 218 | 288
Oil, Gas and Lodging Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 30,758 | 28,537 | 91,363 | 94,419
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 655 | 121 | 989 | 2,064
Corporate Items | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Corporate Items | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (764) | (566) | (2,005) | (1,855)
Corporate Items | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ (109) | $ (445) | $ (1,016) | $ 209

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