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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2025
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Closure and Post-Closure Liabilities
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2025 through March 31, 2025 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2025$59,400 $70,388 $129,788 
Measurement period adjustments from prior period acquisitions— 420 420 
New asset retirement obligations899 — 899 
Accretion1,230 1,341 2,571 
Changes in estimates recorded to consolidated statement of operations273 370 643 
Changes in estimates recorded to consolidated balance sheet— 98 98 
Expenditures(156)(103)(259)
Currency translation and other5 4 9 
Balance at March 31, 2025$61,651 $72,518 $134,169