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Retirement Plans - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Compensation And Retirement Disclosure [Abstract]        
Employer contribution for first 3% of employee contributions     100.00%  
Employer contribution for next 2% of employee contributions     50.00%  
Percentage of first specified employee contributions     3.00%  
Percentage of next specified employee contributions     2.00%  
Contribution for retirement plan $ 14,567 $ 6,138 $ 42,177 $ 36,778