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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Adjusted EBITDA $ 80,135 $ 67,320
Reconciliation to Consolidated Statements of Operations:    
Accretion of environmental liabilities 2,290 2,505
Depreciation and amortization 72,412 68,902
Income (loss) from operations 5,433 (4,087)
Other expense 1,549 350
Interest expense, net of interest income 22,576 18,980
(Loss) income before (benefit) provision for income taxes (18,692) (23,417)
Technical Services    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 58,488 60,398
Industrial and Field Services    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 1,913 433
Safety-Kleen    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 52,368 40,055
Oil, Gas and Lodging Services    
Segment Reporting Information [Line Items]    
Adjusted EBITDA (211) 1,310
Corporate Items    
Segment Reporting Information [Line Items]    
Adjusted EBITDA $ (32,423) $ (34,876)