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ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS
 9 Months Ended
Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract]  
ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS
Accrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs of our landfills in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill as well as the duration of the post-closure monitoring period.
A summary of the changes to accrued final capping, closure and post-closure liabilities follows:
 Nine Months Ended
September 30,
 20252024
Beginning balance$172,230 $133,904 
Obligations incurred6,325 5,230 
Revision in estimates (1)
— 8,477 
Accretion expense 10,942 8,569 
Obligations settled (2)
(5,960)(6,545)
Ending balance$183,537 $149,635 
(1)Relates to the revision in estimates of the post-closure liability for the Town of Southbridge, Massachusetts landfill (“Southbridge Landfill”). See Note 11, Other Items and Charges for further disclosure.
(2)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.