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SEGMENT REPORTING - Adjusted EBITDA and Significant Segment Expense Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Direct Revenues $ 6,030,837 $ 5,889,952 $ 5,409,152
Cost of Revenues 4,144,599 4,065,713 3,746,124
Selling, general and administrative expenses 752,534 739,629 671,161
Total Reportable Segments      
Segment Reporting Information [Line Items]      
Direct Revenues 6,030,651 5,889,545 5,408,705
Cost of Revenues 4,088,903 4,025,239 3,709,344
Selling, general and administrative expenses 460,518 449,838 424,880
Total Reportable Segment Adjusted EBITDA 1,481,230 1,414,468 1,274,481
Environmental Services      
Segment Reporting Information [Line Items]      
Direct Revenues 5,193,290 5,004,747 4,511,442
Cost of Revenues 3,461,985 3,366,022 3,063,043
Selling, general and administrative expenses 387,529 371,263 346,791
Total Reportable Segment Adjusted EBITDA 1,343,776 1,267,462 1,101,608
Safety-Kleen Sustainability Solutions      
Segment Reporting Information [Line Items]      
Direct Revenues 837,361 884,798 897,263
Cost of Revenues 626,918 659,217 646,301
Selling, general and administrative expenses 72,989 78,575 78,089
Total Reportable Segment Adjusted EBITDA $ 137,454 $ 147,006 $ 172,873