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Federal Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Gross federal net operating loss $ 11,900,000    
Start expiry date 2030    
End expiry date 2031    
General business tax credits 500,000    
Expiry date 2028    
Expiry end date 2033    
Federal alternative minimum tax credits with an indefinite life 900,000    
Net operating loss relates to unrealized excess benefits 300,000    
Reversal of valuation allowance against net deferred tax asset   27,400,000  
Reversal of valuation allowance against net deferred tax asset resulting from 2011 pre-tax income   2,200,000  
Unrecognized tax benefits 0   0
Accruals of any interest or penalties $ 0   $ 0