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DEBT - Summary of Debt (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Weighted-average discount rate - finance leases 4.40%  
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.4% $ 62,726 $ 53,066
Principal amount of debt 1,051,576 1,054,546
Less—unamortized debt issuance costs 9,621 11,103
Debt less unamortized debt issuance costs 1,041,955 1,043,443
Less—current maturities of debt 65,335 35,781
Debt, less current portion $ 976,620 $ 1,007,662
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Debt, less current portion Debt, less current portion
Secured Debt | Term loan A facility (“Term Loan Facility”) payable quarterly with balance due December 2026; bearing interest at 6.779% as of June 30, 2024    
Debt Instrument [Line Items]    
Stated interest rate 6.779%  
Principal amount of debt $ 348,250 $ 350,000
Secured Debt | Term loan A facility (“2023 Term Loan Facility”) payable quarterly with balance due December 2026; bearing interest at 7.279% as of June 30, 2024    
Debt Instrument [Line Items]    
Stated interest rate 7.279%  
Principal amount of debt $ 408,500 419,250
Line of Credit | Revolving credit facility (“Revolving Credit Facility”) due December 2026; bearing interest at term secured overnight financing rate (“Term SOFR”) plus 1.435%    
Debt Instrument [Line Items]    
Variable rate margin 1.435%  
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”) due January 2025 - fixed rate interest period bearing interest at 5.25% through January 2025    
Debt Instrument [Line Items]    
Stated interest rate 5.25%  
Principal amount of debt $ 25,000 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 | 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 | 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 maturing through March 2025; bearing interest up to 8.1%    
Debt Instrument [Line Items]    
Stated interest rate 8.10%  
Principal amount of debt $ 100 $ 230