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Stock Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised     $ 900,000 $ 1,400,000
Unrecognized stock option compensation cost 6,200,000   6,200,000  
Weighted-average recognition period     2 years 11 months 12 days  
Stock option compensation expense 713,000 722,000 1,439,000 1,393,000
Options available for grant in period 271,982   271,982  
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average recognition period 11 months 19 days      
Restricted stock granted in period 19,691      
Restricted stock vesting period 1 year      
Restricted stock vesting percentage 100.00%      
Fair value of restricted stock at grant date $ 16.00      
Unrecognized restricted stock compensation cost $ 288,750   $ 288,750