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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended		3 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Federal and State	Dec. 31, 2012 State and Local Jurisdiction	Dec. 31, 2012 Internal Revenue Service (IRS)	Mar. 31, 2013 Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward assets		$ 8.5
NOL carryforward assets expiration date			2019	2029
Cumulative Alternative minimum tax credit carryforwards	$ 1.5
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, 2009; December 31, 2010; and December 31, 2011.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates.

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