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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

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