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Stock Incentive Plans and Stock Purchase Plans - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 03, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future grants and awards under Stock Incentive Plans   4,500,000   4,500,000  
Stock-based compensation expense related to its stock incentive plans and ESPP   $ 8.7 $ 8.2 $ 25.9 $ 24.0
Excess tax benefit related to employee stock incentive plans       $ 3.3  
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of years over which options become exercisable on a pro rata basis       3 years  
Stock Option [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of options, maximum years       10 years  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of years over which options become exercisable on a pro rata basis       3 years  
1996 Non-Qualified Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of market value of common stock at which employees are permitted to purchase 85.00%        
2015 Non-Qualified Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of market value of common stock at which employees are permitted to purchase 90.00%        
Amended and Restated 2008 Plan [Member] | Employee And Non Employee Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock granted to employees and non-employees       501,325  
1996 Non-Qualified Employee Stock Purchase Plan and 2015 Non-Qualified Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued under Stock Purchase Plan       226,798  
Common stock, aggregate shares authorized   2,500,000   2,500,000  
Shares reserved for issuance   2,400,000   2,400,000