DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Debt Instrument [Line Items]
Weighted-average discount rate - finance leases	4.708%
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.708% as of March 31, 2026	$ 89,969	$ 94,035
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt, less current portion	Debt, less current portion
Principal amount of debt	$ 1,164,566	$ 1,168,632
Less—unamortized debt issuance costs	13,223	13,970
Debt less unamortized debt issuance costs	1,151,343	1,154,662
Less—current maturities of debt	24,588	25,735
Debt, less current portion	$ 1,126,755	1,128,927
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 5.218% as of March 31, 2026
Debt Instrument [Line Items]
Stated interest rate	5.218%
Principal amount of debt	$ 800,000	800,000
Line of Credit | 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
Debt Instrument [Line Items]
Principal amount of debt	$ 273,500
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 4.250% through September 2030
Debt Instrument [Line Items]
Stated interest rate	4.25%
Principal amount of debt	$ 37,500	37,500
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 2015R-3 (“FAME Bonds 2015R-3”) due August 2035 - fixed rate interest period bearing interest at 5.000% through August 2035
Debt Instrument [Line Items]
Stated interest rate	5.00%
Principal amount of debt	$ 29,000	29,000
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 5.000% 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%		4.375%
Principal amount of debt	$ 25,000	25,000
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 2.950% 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	$ 1,097	$ 1,097