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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes to Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 1,477,199 $ 1,287,736
Increase from current period acquisitions   193,368
Measurement period adjustments from prior period acquisition 47 218
Decrease from disposition of business (538)  
Foreign currency translation 2,342 (4,123)
Goodwill, end of period 1,479,050 1,477,199
Environmental Services    
Goodwill [Roll Forward]    
Goodwill, beginning of period 1,296,204 1,112,013
Increase from current period acquisitions   186,911
Measurement period adjustments from prior period acquisition 146 218
Decrease from disposition of business (538)  
Foreign currency translation 1,666 (2,938)
Goodwill, end of period 1,297,478 1,296,204
Safety-Kleen Sustainability Solutions    
Goodwill [Roll Forward]    
Goodwill, beginning of period 180,995 175,723
Increase from current period acquisitions   6,457
Measurement period adjustments from prior period acquisition (99) 0
Decrease from disposition of business 0  
Foreign currency translation 676 (1,185)
Goodwill, end of period $ 181,572 $ 180,995