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LONG-TERM DEBT - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 | Mar. 31, 2017 USD ($) interest_rate_derviative
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on debt extinguishment | $ 0 |  | $ 191,000 | $ 517,000 | $ 736,000 |  |
Cash Flow Hedging |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative asset fair value | 58,000 |  |  | 58,000 |  |  |
Derivative liability fair value | $ 321,000 |  |  | $ 321,000 |  |  |
Cash Flow Hedging | Interest Rate Derivative |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate derivatives entered into | interest_rate_derviative |  |  |  |  |  |  | 3
Notional amount |  |  |  |  |  |  | $ 60,000,000
Weighted average percentage rate paid |  |  |  |  |  |  | 1.95%
Cash Flow Hedging | Interest Rate Derivative - February 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 35,000,000
Cash Flow Hedging | Interest Rate Derivative - February 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 25,000
Maine Bonds | Variable Rate Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 3,600,000
LIBOR | Cash Flow Hedging | Interest Rate Derivative |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Floor interest rate received |  |  |  |  |  |  | 1.00%
Secured Debt | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  | $ 350,000,000 |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 2.75% |  | 3.00% |
Secured Debt | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net leverage ratio | 3.75 |  |  | 3.75 |  |  |
Secured Debt | LIBOR | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 2.75% |  |  |
Secured Debt | LIBOR | Consolidated net leverage ratio of 3.75x or less | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 2.50% |  |  |
Secured Debt | LIBOR Floor | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 1.00% |  |  |
Secured Debt | LIBOR Floor | Consolidated net leverage ratio of 3.75x or less | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 1.00% |  |  |
Secured Debt | Base Rate | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Decrease in applicable interest margin (basis points) |  | 0.25% |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 1.75% |  |  |
Secured Debt | Base Rate | Consolidated net leverage ratio of 3.75x or less | Term Loan B Facility due October 2023; bearing interest at LIBOR plus 3.00% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument variable rate basis (percentage) |  |  |  | 1.50% |  |  |
New York Bonds 2016 | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 21,400,000
New York Bonds 2016 | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 25,000,000
Debt instrument interest rate percentage |  |  |  |  |  |  | 5.25%
Senior Subordinated Notes Due 2019 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate percentage |  |  | 7.75% |  | 7.75% |  |
Revolving Credit Facility | Line of Credit | Revolving Credit Facility due October 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving facility amount |  | $ 160,000,000 |  |  |  |  |

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