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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation to Consolidated Statements of Operations:      
Corporate Costs $ 311,291 $ 297,534 $ 261,911
Accretion of environmental liabilities 14,326 13,456 13,667
Stock-based compensation 32,702 27,981 20,703
Depreciation and amortization 446,006 400,922 365,761
Third-party transaction related costs 3,533 0 0
Kimball startup costs 0 4,343 0
Income from operations 673,372 670,232 612,439
Other (income) expense, net (5,200) 1,454 (2,315)
Loss on early extinguishment of debt 8,277 371 2,880
Gain on sale of businesses (776) 0 0
Interest expense, net of interest income 143,104 134,964 108,595
Income before provision for income taxes 527,967 533,443 503,279
Environmental Services      
Segment Reporting Information [Line Items]      
Total Reportable Segment Adjusted EBITDA 1,343,776 1,267,462 1,101,608
Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Total Reportable Segment Adjusted EBITDA 137,454 147,006 172,873
Operating segments      
Segment Reporting Information [Line Items]      
Total Reportable Segment Adjusted EBITDA 1,481,230 1,414,468 1,274,481
Operating segments | Environmental Services      
Segment Reporting Information [Line Items]      
Total Reportable Segment Adjusted EBITDA 1,343,776 1,267,462 1,101,608
Operating segments | Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Total Reportable Segment Adjusted EBITDA $ 137,454 $ 147,006 $ 172,873