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Stock Compensation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of stock options exercised $ 668,279 $ 427,100
Stock compensation expense 726,000 671,000
Unrecognized compensation cost $ 4,000,000  
Weighted-average recognition period 2 years 8 months 16 days  
Options available for grant in period 548,073