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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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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