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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2023 through December 31, 2024 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2023$62,251 $56,550 $118,801 
Liabilities assumed in acquisitions— 574 574 
Measurement period adjustments from prior period acquisitions— 3,015 3,015 
New asset retirement obligations3,092 — 3,092 
Accretion4,958 4,519 9,477 
Changes in estimates recorded to consolidated statement of operations1,147 53 1,200 
Changes in estimates recorded to consolidated balance sheet(3,706)1,600 (2,106)
Environmental expenditures(8,478)(7,206)(15,684)
Currency translation and other179 52 231 
Balance at December 31, 202359,443 59,157 118,600 
Liabilities assumed in acquisitions— 11,421 11,421 
New asset retirement obligations2,118 — 2,118 
Accretion5,069 4,489 9,558 
Changes in estimates recorded to consolidated statement of operations70 (295)(225)
Changes in estimates recorded to consolidated balance sheet4,335 402 4,737 
Environmental expenditures(11,210)(4,466)(15,676)
Currency translation and other(425)(320)(745)
Balance at December 31, 2024$59,400 $70,388 $129,788 
Schedule of Expected Payments Related to Asset Retirement Obligations
Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Years ending December 31, 
2025$10,304 
202614,457 
202712,485 
202814,127 
20293,224 
Thereafter278,762 
Undiscounted closure and post-closure liabilities333,359 
Less: Discount at credit-adjusted risk-free rate(119,353)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed(84,218)
Present value of closure and post-closure liabilities$129,788