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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reconciliation to Consolidated Statements of Operations:        
Corporate Costs $ 78,007 $ 71,914 $ 224,266 $ 219,569
Accretion of environmental liabilities 3,499 3,618 10,710 10,139
Stock-based compensation 8,922 5,837 22,620 20,690
Depreciation and amortization 114,729 100,063 342,994 295,632
Income from operations 193,009 192,296 514,926 533,264
Other (income) expense, net (3,517) 1,123 (1,982) 2,431
Interest expense, net of interest income 35,700 35,779 108,883 100,767
Income before provision for income taxes 160,826 155,394 408,025 430,066
Environmental Services        
Segment Reporting Information [Line Items]        
Total Reportable Segment Adjusted EBITDA 357,229 332,502 1,008,014 956,892
Safety-Kleen Sustainability Solutions        
Segment Reporting Information [Line Items]        
Total Reportable Segment Adjusted EBITDA 40,937 41,226 107,502 122,402
Operating Segments        
Segment Reporting Information [Line Items]        
Total Reportable Segment Adjusted EBITDA 398,166 373,728 1,115,516 1,079,294
Operating Segments | Environmental Services        
Segment Reporting Information [Line Items]        
Total Reportable Segment Adjusted EBITDA 357,229 332,502 1,008,014 956,892
Operating Segments | Safety-Kleen Sustainability Solutions        
Segment Reporting Information [Line Items]        
Total Reportable Segment Adjusted EBITDA $ 40,937 $ 41,226 $ 107,502 $ 122,402