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Summary of Stock Option (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Options  
Beginning balance 2,371,650
Grants 100,000
Exercises (105,213)
Cancellations (5,000)
Ending balance 2,361,437
Options exercisable at End of Period 1,450,637
Weighted-average exercise price  
Beginning balance $ 12.75
Grants $ 18.04
Exercises $ 11.41
Cancellations $ 15.60
Ending balance $ 13.03
Options exercisable at End of Period $ 13.21
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 6 years 1 month 28 days
Options exercisable, Ending balance 5 years 1 month 2 days
Aggregate intrinsic value  
Options outstanding, end of period $ 14,624,245
Options exercisable, end of period $ 9,948,309