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Income Taxes - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2015
USD ($)
Operating Loss Carryforwards [Line Items]  
Alternative Minimum tax credit carryforwards $ 1,500,000
Internal Revenue Service (IRS)  
Operating Loss Carryforwards [Line Items]  
NOL carryforward assets expiration date 2035
Federal  
Operating Loss Carryforwards [Line Items]  
Tax examination description The Company remains subject to examination by Federal, Maine, Massachusetts, and New Hampshire tax authorities for the tax periods ended December 31, 2012; December 31, 2013 and December 31, 2014.
Federal and State  
Operating Loss Carryforwards [Line Items]  
Net Operating Loss carryforward assets $ 15,100,000
State and Local Jurisdiction  
Operating Loss Carryforwards [Line Items]  
NOL carryforward assets expiration date 2029