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Summary of Stock Option (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Options  
Beginning balance 2,371,650
Grants 394,400
Exercises (131,563)
Cancellations (31,000)
Expirations (12,000)
Ending balance 2,591,487
Options exercisable at End of Period 1,740,362
Weighted-average exercise price  
Beginning balance $ 12.75
Grants $ 18.83
Exercises $ 11.10
Cancellations $ 12.21
Expirations $ 18.22
Ending balance $ 13.74
Options exercisable at End of Period $ 13.06
Weighted-average remaining contractual life (years)  
Options outstanding, End of Period 6 years 4 months 10 days
Options exercisable, End of Period 5 years 3 months
Aggregate intrinsic value  
Options outstanding, End of period $ 10,230,843
Options exercisable, End of period $ 8,507,338