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BUSINESS COMBINATIONS - 2018 Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2018
Feb. 23, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]          
Goodwill recognized       $ 12,536  
Acquired Company Included in Safety-Kleen and Environmental Services Segments          
Business Acquisition [Line Items]          
Goodwill recognized $ 12,300        
Purchase price $ 26,700        
Veolia Division          
Business Acquisition [Line Items]          
Purchase price   $ 124,500      
Weighted average amortization period (in years)   8 years 2 months 12 days      
Pre-tax income     $ 2,100   $ 3,300