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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]    
Alternative Minimum tax credit carryforwards   $ 2.1
Internal Revenue Service (IRS)    
Operating Loss Carryforwards [Line Items]    
NOL carryforward assets expiration date   2029
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, 2011; December 31, 2012; and December 31, 2013.  
Federal and State    
Operating Loss Carryforwards [Line Items]    
Net Operating Loss carryforward assets   $ 13.1
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
NOL carryforward assets expiration date   2019
Federal Tax | Internal Revenue Service (IRS)    
Operating Loss Carryforwards [Line Items]    
Net Operating Loss carryforward assets   $ 2.1