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Share-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Compensation expense in stock compensation plans $ 597,813 $ 808,293
Income tax benefit of stock compensation plans 209,235 282,903
Unrecognized compensation expense related to nonvested share-based compensation granted under the plan $ 3,100,000  
Weighted average period of unrecognized compensation expense 1 year 3 months 18 days  
Cash from option exercises $ 1,500,000 704,025
Tax benefit for tax deductions related to option exercises $ 107,534 $ 34,596