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Summary of Stock Option Activity (Detail) - Employee Stock Option - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Options Outstanding Number of Shares    
Outstanding at beginning of period 1,626,582  
Granted 256,191  
Exercised (268,713)  
Forfeited (19,825)  
Outstanding at end of period 1,594,235  
Exercisable at end of period 739,901  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 34.87  
Granted 69.61  
Exercised 26.81  
Forfeited 30.96  
Outstanding at end of period 41.86  
Exercisable at end of period 29.35  
Weighted Average Fair Value    
Outstanding at beginning of period 11.94  
Granted 20.10 $ 19.75
Exercised 10.10  
Forfeited 11.47  
Outstanding at end of period 13.57  
Exercisable at end of period $ 10.63  
Weighted Average Remaining Contractual Life    
Outstanding at end of period 4 years 8 months 19 days  
Exercisable at end of period 3 years 4 months 17 days