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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

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