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LONG-TERM DEBT - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016	Mar. 31, 2017 USD ($) interest_rate_derviative
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 46,000	$ 593,000	$ 517,000	$ 545,000
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		$ 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
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%
Early retirement of debt		$ 19,730,000		$ 19,730,000
Maine Bonds | Variable Rate Bonds
Debt Instrument [Line Items]
Aggregate principal amount						$ 3,600,000
Cash Flow Hedging
Debt Instrument [Line Items]
Derivative asset fair value	$ 95,000		$ 95,000
Derivative liability fair value	$ 373,000		373,000
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
LIBOR | Secured Debt | 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%
LIBOR | Cash Flow Hedging | Interest Rate Derivative
Debt Instrument [Line Items]
Floor interest rate received						1.00%
LIBOR Floor | Secured Debt | 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%
Base Rate | Secured Debt | 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%
Revolving Credit Facility | Line of Credit | Revolving Credit Facility due October 2021
Debt Instrument [Line Items]
Revolving facility amount	$ 160,000,000		$ 160,000,000
Consolidated net leverage ratio of 3.75x or less | LIBOR | Secured Debt | 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%
Consolidated net leverage ratio of 3.75x or less | LIBOR Floor | Secured Debt | 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%
Consolidated net leverage ratio of 3.75x or less | Base Rate | Secured Debt | 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%

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