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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ 187,771 $ 138,266 $ 317,222 $ 264,147
Reconciliation of Net Income to Adjusted EBITDA [Abstract]        
Accretion of environmental liabilities 2,873 2,766 5,826 5,327
Stock-based compensation 3,305 2,786 6,785 6,077
Depreciation and amortization 71,592 72,494 143,755 147,027
Income from operations 110,001 60,220 160,856 105,716
Other expense, net 1,480 500 2,708 2,865
Loss on sale of businesses 0 184 0 3,258
Interest expense, net of interest income 18,051 18,654 35,969 37,441
Income before provision for income taxes 90,470 40,882 122,179 62,152
Operating segments | Environmental Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 176,041 176,241 316,295 322,099
Operating segments | Safety-Kleen Sustainability Solutions        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 63,314 8,431 94,946 32,635
Corporate, non-Segment        
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ (51,584) $ (46,406) $ (94,019) $ (90,587)