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DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 543,067 | $ 522,728
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.6% | 28,263 | 18,364
Less - unamortized debt issuance costs | 8,362 | 9,406
Debt less unamortized debt issuance costs | 534,705 | 513,322
Less—current maturities of debt | 6,948 | 4,301
Debt, less current portion | $ 527,757 | $ 509,021
Weighted-average discount rate - finance leases | 4.60% | 4.60%
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 | $ 37,700 | $ 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% | 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% | 1.75%
Credit Facility |  |
Debt Instrument [Line Items] |  |
Less - unamortized debt issuance costs | $ 4,659 | $ 5,478
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") due December 2044 - fixed rate interest period through 2019; bearing interest at 2.875% |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | 25,000 | 25,000
Less - unamortized debt issuance costs | $ 1,034 | $ 1,057
Stated interest rate | 2.875% | 2.875%
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] |  |
Principal amount of debt | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 359 | $ 390
Stated interest rate | 3.125% | 3.125%
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] |  |
Principal amount of debt | $ 25,000 | $ 25,000
Less - unamortized debt issuance costs | $ 389 | $ 432
Stated interest rate | 5.25% | 5.25%
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] |  |
Principal amount of debt | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 517 | $ 552
Stated interest rate | 5.125% | 5.125%
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] |  |
Principal amount of debt | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 380 | $ 417
Stated interest rate | 4.375% | 4.375%
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] |  |
Principal amount of debt | $ 16,000 | $ 16,000
Less - unamortized debt issuance costs | $ 514 | $ 541
Stated interest rate | 4.625% | 4.625%
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] |  |
Principal amount of debt | $ 11,000 | $ 11,000
Less - unamortized debt issuance costs | $ 510 | $ 539
Stated interest rate | 2.95% | 2.95%
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5% |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 5,104 | $ 5,464
Weighted average interest rate | 3.50% | 3.50%

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