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SEGMENT REPORTING - Adjusted EBITDA and Significant Segment Expense Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Direct Revenues $ 1,549,337 $ 1,529,422 $ 4,531,141 $ 4,458,836
Cost of Revenues 1,048,490 1,055,599 3,103,871 3,062,211
Selling, General and Administrative Expenses 189,610 177,846 558,640 557,590
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Direct Revenues 1,549,337 1,529,326 4,530,955 4,458,539
Cost of Revenues 1,030,032 1,045,534 3,068,850 3,037,458
Selling, General and Administrative Expenses 121,139 110,064 346,589 341,787
Total Reportable Segment Adjusted EBITDA 398,166 373,728 1,115,516 1,079,294
Environmental Services        
Segment Reporting Information [Line Items]        
Direct Revenues 1,331,300 1,297,187 3,892,448 3,779,080
Cost of Revenues 871,487 874,414 2,592,300 2,541,017
Selling, General and Administrative Expenses 102,584 90,271 292,134 281,171
Total Reportable Segment Adjusted EBITDA 357,229 332,502 1,008,014 956,892
Safety-Kleen Sustainability Solutions        
Segment Reporting Information [Line Items]        
Direct Revenues 218,037 232,139 638,507 679,459
Cost of Revenues 158,545 171,120 476,550 496,441
Selling, General and Administrative Expenses 18,555 19,793 54,455 60,616
Total Reportable Segment Adjusted EBITDA $ 40,937 $ 41,226 $ 107,502 $ 122,402