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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 3,700,000  
Shares reserved for future issuance 20,000,000  
Weighted average grant date value $ 78.86 $ 55.61
Employee Stock Purchase Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 899,000  
Shares reserved for future issuance 2,000,000  
Percentage of annual compensation participants may contribute 15.00%  
Purchase price as a percentage of closing price on the last day of the quarter for ESPP transactions 85.00%  
Stock Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Contractual term (in years) 10 years  
Unvested options to purchase 3,100,000 3,300,000
Total unrecognized compensation cost $ 69.8  
Weighted average amortization period (in years) 3 years 4 months 24 days  
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 3 years  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 6 years