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REMEDIAL LIABILITIES - Changes in Remedial Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Site Contingency [Line Items]    
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Current portion of closure, post-closure and remedial liabilities Current portion of closure, post-closure and remedial liabilities
Changes to remedial liabilities    
Balance at the beginning of the period $ 111,745 $ 111,243
Liabilities assumed in acquisitions   5,192
Measurement period adjustments from prior period acquisition (90)  
Accretion 3,761 3,898
Changes in estimates recorded to consolidated statement of operations (10,222) 4,364
Environmental expenditures (9,934) (11,846)
Currency translation and other 109 (1,106)
Balance at the end of the period 95,369 111,745
Remedial Liabilities for Landfill Sites    
Changes to remedial liabilities    
Balance at the beginning of the period 1,948 1,880
Liabilities assumed in acquisitions   0
Measurement period adjustments from prior period acquisition 0  
Accretion 93 92
Changes in estimates recorded to consolidated statement of operations (66) 29
Environmental expenditures (47) (53)
Currency translation and other 0 0
Balance at the end of the period 1,928 1,948
Remedial Liabilities for Inactive Sites    
Changes to remedial liabilities    
Balance at the beginning of the period 57,036 60,277
Liabilities assumed in acquisitions   0
Measurement period adjustments from prior period acquisition 0  
Accretion 2,353 2,292
Changes in estimates recorded to consolidated statement of operations (860) 573
Environmental expenditures (4,163) (6,078)
Currency translation and other 157 (28)
Balance at the end of the period 54,523 57,036
Remedial Liabilities (Including Superfund) for Non-Landfill Operations    
Changes to remedial liabilities    
Balance at the beginning of the period 52,761 49,086
Liabilities assumed in acquisitions   5,192
Measurement period adjustments from prior period acquisition (90)  
Accretion 1,315 1,514
Changes in estimates recorded to consolidated statement of operations (9,296) 3,762
Environmental expenditures (5,724) (5,715)
Currency translation and other (48) (1,078)
Balance at the end of the period $ 38,918 $ 52,761