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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Federal
Dec. 31, 2011
Federal and State
Dec. 31, 2011
State and Local Jurisdiction
Dec. 31, 2011
Internal Revenue Service (IRS)
Sep. 30, 2012
Internal Revenue Service (IRS)
Net Operating Loss Carryforwards
Operating Loss Carryforwards [Line Items]            
Net operating loss $ (12.4)          
Net Operating Loss carryforward assets     9.3      
NOL carryforward assets expiration date       2019 2029  
Alternative Minimum tax credit carryforwards 1.5          
Operating Loss Refunds           $ 2.0
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