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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Income Tax Disclosure [Abstract]    
Cumulative effect on retained earnings   $ 0
Unrecognized tax benefits 0 0
Years under examination   2004
Years under examination, one   2012
Years under examination, Description   For all major taxing jurisdictions, the tax years 2004 through 2012 remain open to examination or re-examination.
Deferred tax assets, decrease in valuation allowance $ 39,000 $ 218,000