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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Federal income tax statutory rate 35.00% 34.00% 34.00%
Retained earnings $ 5,837,000 $ 5,837,000 $ 5,837,000
Portion of retained earnings not treated for deferred federal income tax liability 0 0 0
Unrecorded deferred income tax liability 1,985,000 1,985,000 1,985,000
Domestic Tax Authority [Member]
     
Income Taxes [Line Items]      
Recognized deferred federal income tax liability $ 0 $ 0 $ 0