v3.25.2
DEBT - Summary of Debt (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Weighted-average discount rate - finance leases 4.70%  
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.7% $ 79,055 $ 69,662
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Debt, less current portion Debt, less current portion
Principal amount of debt $ 1,157,518 $ 1,148,162
Less—unamortized debt issuance costs 14,044 14,911
Debt less unamortized debt issuance costs 1,143,474 1,133,251
Less—current maturities of debt 22,511 42,619
Debt, less current portion $ 1,120,963 1,090,632
Secured Debt | Term loan A facility (“Term Loan Facility”) payable quarterly beginning in the fiscal year ended December 31, 2027 with balance due September 2029; bearing interest at 5.877% as of June 30, 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.877%  
Principal amount of debt $ 800,000 800,000
Line of Credit | Revolving credit facility (“Revolving Credit Facility”) due September 2029; bearing interest at term secured overnight financing rate (“Term SOFR”) plus 1.550%    
Debt Instrument [Line Items]    
Variable rate margin 1.55%  
Principal amount of debt $ 0 0
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 (“New York Bonds 2014R-1”) due December 2044 - fixed rate interest period bearing interest at 2.875% through December 2029    
Debt Instrument [Line Items]    
Stated interest rate 2.875%  
Principal amount of debt $ 25,000 25,000
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 (“New York Bonds 2014R-2”) due December 2044 - fixed rate interest period bearing interest at 3.125% through May 2026    
Debt Instrument [Line Items]    
Stated interest rate 3.125%  
Principal amount of debt $ 15,000 15,000
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 (“New York Bonds 2020”) due September 2050 - fixed rate interest period bearing interest at 2.750% through September 2025    
Debt Instrument [Line Items]    
Stated interest rate 2.75%  
Principal amount of debt $ 40,000 40,000
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020R-2 (“New York Bonds 2020R-2”) due September 2050 - fixed rate interest period bearing interest at 5.125% through September 2030    
Debt Instrument [Line Items]    
Stated interest rate 5.125%  
Principal amount of debt $ 35,000 35,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 (“FAME Bonds 2005R-3”) paid in January 2025 - fixed rate interest period bore interest at 5.25% through January 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.25%  
Principal amount of debt $ 0 25,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 (“FAME Bonds 2015R-1”) due August 2035 - fixed rate interest period bearing interest at 5.125% through July 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.125%  
Principal amount of debt $ 15,000 15,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 (“FAME Bonds 2015R-2”) due August 2035 - fixed rate interest period bearing interest at 4.375% through July 2025    
Debt Instrument [Line Items]    
Stated interest rate 4.375%  
Principal amount of debt $ 15,000 15,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2024 (“FAME Bonds 2024”) due December 2047 - fixed rate interest period bearing interest at 4.625% through May 2035    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Principal amount of debt $ 45,000 45,000
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 (“Vermont Bonds 2013”) due April 2036 - fixed rate interest period bearing interest at 4.625% through April 2028    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Principal amount of debt $ 16,000 16,000
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 (“Vermont Bonds 2022A-1”) due June 2052 - fixed rate interest period bearing interest at 5.00% through May 2027    
Debt Instrument [Line Items]    
Stated interest rate 5.00%  
Principal amount of debt $ 35,000 35,000
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds Series 2022A-2 (“Vermont Bonds 2022A-2”) due June 2052 - fixed rate interest period bearing interest at 4.375% through May 2032    
Debt Instrument [Line Items]    
Stated interest rate 4.375%  
Principal amount of debt $ 25,000 0
Unsecured Debt | Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 (“New Hampshire Bonds”) due April 2029 - fixed rate interest period bearing interest at 2.95% through April 2029    
Debt Instrument [Line Items]    
Stated interest rate 2.95%  
Principal amount of debt $ 11,000 11,000
Notes payable with no stated interest rate maturing through September 2028    
Debt Instrument [Line Items]    
Principal amount of debt $ 1,463 $ 1,500