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DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 02, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Weighted-average discount rate - finance leases 4.30%    
Principal amount of debt $ 549,057   $ 522,728
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.3% 32,045   18,364
Less - unamortized debt issuance costs 9,340   9,406
Debt less unamortized debt issuance costs 539,717   513,322
Less—current maturities of debt 8,588   4,301
Debt, less current portion 531,129   509,021
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75%      
Debt Instrument [Line Items]      
Principal amount of debt $ 0   26,900
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75% | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75%      
Debt Instrument [Line Items]      
Principal amount of debt $ 350,000   350,000
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75% | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Credit Facility      
Debt Instrument [Line Items]      
Less - unamortized debt issuance costs $ 4,249   5,478
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 through 2029; bearing interest at 2.875%      
Debt Instrument [Line Items]      
Stated interest rate 2.875%    
Principal amount of debt $ 25,000   25,000
Less - unamortized debt issuance costs $ 1,017   1,057
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 through 2026; bearing interest at 3.125%      
Debt Instrument [Line Items]      
Stated interest rate 3.125%    
Principal amount of debt $ 15,000   15,000
Less - unamortized debt issuance costs $ 344   390
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 through 2025; bearing interest at 2.750%      
Debt Instrument [Line Items]      
Stated interest rate 2.75% 2.75%  
Principal amount of debt $ 40,000   0
Less - unamortized debt issuance costs $ 1,505   0
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 through 2025; bearing interest at 5.25%      
Debt Instrument [Line Items]      
Stated interest rate 5.25%    
Principal amount of debt $ 25,000   25,000
Less - unamortized debt issuance costs $ 368   432
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 through 2025; bearing interest at 5.125%      
Debt Instrument [Line Items]      
Stated interest rate 5.125%    
Principal amount of debt $ 15,000   15,000
Less - unamortized debt issuance costs $ 500   552
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 through 2025; bearing interest at 4.375%      
Debt Instrument [Line Items]      
Stated interest rate 4.375%    
Principal amount of debt $ 15,000   15,000
Less - unamortized debt issuance costs $ 362   417
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%      
Debt Instrument [Line Items]      
Stated interest rate 4.625%    
Principal amount of debt $ 16,000   16,000
Less - unamortized debt issuance costs $ 500   541
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 through 2029; bearing interest at 2.95%      
Debt Instrument [Line Items]      
Stated interest rate 2.95%    
Principal amount of debt $ 11,000   11,000
Less - unamortized debt issuance costs $ 495   539
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5%      
Debt Instrument [Line Items]      
Weighted average interest rate 3.50%    
Principal amount of debt $ 5,012   $ 5,464