v3.26.1
SEGMENT REPORTING - Reconciliation of Third Party Revenues to Direct Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Total revenues $ 1,459,537 $ 1,431,950
Total Segment Revenues    
Segment Reporting Information [Line Items]    
Total revenues 1,459,537 1,431,853
Environmental Services    
Segment Reporting Information [Line Items]    
Total revenues 1,252,526 1,209,113
Safety-Kleen Sustainability Solutions    
Segment Reporting Information [Line Items]    
Total revenues 207,011 222,740
Operating Segments | Total Segment Revenues    
Segment Reporting Information [Line Items]    
Total revenues 1,459,537 1,431,853
Operating Segments | Environmental Services    
Segment Reporting Information [Line Items]    
Total revenues 1,242,448 1,207,038
Operating Segments | Safety-Kleen Sustainability Solutions    
Segment Reporting Information [Line Items]    
Total revenues 217,089 224,815
Intersegment revenues (expense), net | Environmental Services    
Segment Reporting Information [Line Items]    
Total revenues 10,078 2,075
Intersegment revenues (expense), net | Safety-Kleen Sustainability Solutions    
Segment Reporting Information [Line Items]    
Total revenues (10,078) (2,075)
Corporate    
Segment Reporting Information [Line Items]    
Total revenues $ 0 $ 97