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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Taxes [Line Items]              
Income before income taxes $ 2,254,552 $ 8,142,779     $ 10,895,904 $ 17,798,550  
Income tax provision 788,316 2,254,505     2,327,145 5,032,853  
Effective tax rate         21.40%    
Expected effective tax rate 22.10%       22.10%   26.60%
Discrete items recognized     298,000        
Reversed of deferred tax asset valuation allowance       3,021,000      
Maximum
              
Income Taxes [Line Items]              
Net operating loss and business tax credit carry forwards expiration date         At various dates through December 2031    
Available to Reduce Future Federal Income Taxes
              
Income Taxes [Line Items]              
Net operating loss carry forwards 37,633,000       37,633,000    
Business tax credit carry forwards $ 1,520,000       $ 1,520,000