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SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Total revenues $ 6,030,837 $ 5,889,952 $ 5,409,152
Total Segment Revenues      
Segment Reporting Information [Line Items]      
Total revenues 6,030,651 5,889,545 5,408,705
Environmental Services      
Segment Reporting Information [Line Items]      
Total revenues 5,193,290 5,004,747 4,511,442
Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Total revenues 837,361 884,798 897,263
Operating Segments | Total Segment Revenues      
Segment Reporting Information [Line Items]      
Total revenues 6,030,651 5,889,545 5,408,705
Operating Segments | Environmental Services      
Segment Reporting Information [Line Items]      
Total revenues 5,146,354 4,960,325 4,469,909
Operating Segments | Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Total revenues 884,297 929,220 938,796
Intersegment revenues (expense), net | Environmental Services      
Segment Reporting Information [Line Items]      
Total revenues 46,936 44,422 41,533
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Total revenues (46,936) (44,422) (41,533)
Corporate      
Segment Reporting Information [Line Items]      
Total revenues $ 186 $ 407 $ 447