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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Restricted investment securities - landfill closure $ 3,029 $ 2,499
Derivative Asset, Statement Of Financial Position Extensible Enumeration, Not Disclosed Flag Interest rate swaps Interest rate swaps
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Interest rate swaps $ 0 $ 0
Total assets 3,029 2,499
Liabilities:    
Interest rate swaps 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Landfill    
Assets:    
Restricted investment securities - landfill closure 3,029 2,499
Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Interest rate swaps 3,652 7,642
Total assets 3,652 7,642
Liabilities:    
Interest rate swaps 8,679 2,852
Recurring | Significant Other Observable Inputs (Level 2) | Landfill    
Assets:    
Restricted investment securities - landfill closure 0 0
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Interest rate swaps 0 0
Total assets 0 0
Liabilities:    
Interest rate swaps 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Landfill    
Assets:    
Restricted investment securities - landfill closure $ 0 $ 0