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SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 752,788 | $ 697,510 | $ 1,441,729 | $ 1,333,593
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 | 752,788 | 697,510 | 1,441,729 | 1,333,593
Technical Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 254,487 | 229,130 | 484,705 | 448,235
Technical Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 40,001 | 35,578 | 80,045 | 70,422
Technical Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 408 | 667 | 1,130 | 1,055
Technical Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 294,896 | 265,375 | 565,880 | 519,712
Industrial and Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 167,899 | 164,641 | 301,456 | 294,828
Industrial and Field Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (9,067) | (7,922) | (17,426) | (14,597)
Industrial and Field Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (133) | (303) | (29) | (316)
Industrial and Field Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 158,699 | 156,416 | 284,001 | 279,915
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 302,956 | 277,715 | 595,857 | 524,676
Safety-Kleen | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (31,639) | (29,092) | (63,708) | (57,613)
Safety-Kleen | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (2) | 1 | 1 | 367
Safety-Kleen | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 271,315 | 248,624 | 532,150 | 467,430
Oil, Gas and Lodging Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 27,245 | 24,860 | 59,377 | 63,911
Oil, Gas and Lodging Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 705 | 1,436 | 1,089 | 1,788
Oil, Gas and Lodging Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 45 | 79 | 139 | 183
Oil, Gas and Lodging Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 27,995 | 26,375 | 60,605 | 65,882
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 201 | 1,164 | 334 | 1,943
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 | (318) | (444) | (1,241) | (1,289)
Corporate Items | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ (117) | $ 720 | $ (907) | $ 654

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