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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
purchase_period
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
May 16, 2013
shares
Stockholders Equity Note [Line Items]        
Preferred stock, par value (usd per share) | $ / shares $ 0.0001 $ 0.0001    
Total intrinsic value of stock options exercised | $ $ 17,600 $ 18,100 $ 18,200  
Employees’ taxes paid upon the vesting of restricted stock units | $ $ (86,067) $ (46,168) $ (29,857)  
Employee Stock Purchase Plan, Duration Of Offering Period 24 months      
Number of offering periods | purchase_period 4      
Number of shares issued (in thousands) 164,000 202,000 197,000  
Stock-based compensation expense | $ $ 70,763 $ 58,854 $ 54,148  
Stockholder Rights Plan        
Stockholders Equity Note [Line Items]        
Number of shares called by each right (shares) 0.001      
Incentive Plan 2005        
Stockholders Equity Note [Line Items]        
Common Stock Capital Shares Reserved For Future Issuance Shares Available 6,060,265      
2010 Purchase Plan        
Stockholders Equity Note [Line Items]        
Employee stock purchase plan, purchase price as percentage of fair market value of common stock 85.00%      
Restricted Stock Units (RSUs)        
Stockholders Equity Note [Line Items]        
Vested rand released in period, Total intrinsic value | $ $ 146,700 99,500 59,800  
Vested in period, Fair value | $ $ 42,200 $ 46,200 $ 39,100  
Granted (usd per share) | $ / shares $ 262.58 $ 118.77 $ 67.82  
Total unamortized compensation cost | $ $ 80,700      
Weighted average period of total unamortized cost 1 year 10 months 24 days      
Restricted stock units, shares vested and released (shares) 561,692      
Restricted stock units, shares withheld for tax payments 178,324      
Restricted stock units, net issuance 383,368      
Stock Options | Incentive Plan 2005        
Stockholders Equity Note [Line Items]        
Weighted award against authorized maximum (shares) 25% vesting one year from the date of grant and 1/48th each month thereafter      
Market Performance Based Restricted Stock Units        
Stockholders Equity Note [Line Items]        
Vested rand released in period, Total intrinsic value | $ $ 92,700 $ 28,800 $ 17,400  
Vested in period, Fair value | $ $ 19,500 15,000 9,900  
Granted (usd per share) | $ / shares $ 266.78      
Total unamortized compensation cost | $ $ 39,600      
Weighted average period of total unamortized cost 1 year 2 months 12 days      
Restricted stock units, shares vested and released (shares) 312,300      
Restricted stock units, shares withheld for tax payments 130,697      
Restricted stock units, net issuance 181,603      
Market Performance Based Restricted Stock Units | Minimum        
Stockholders Equity Note [Line Items]        
Percentage of market-performance based restricted stock units eligible to vest over the vesting period 250.00%      
Market Performance Based Restricted Stock Units | Maximum        
Stockholders Equity Note [Line Items]        
Stock incentive plan, vesting period 3 years      
Percentage of market-performance based restricted stock units eligible to vest over the vesting period 300.00%      
2010 Purchase Plan        
Stockholders Equity Note [Line Items]        
Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance 571,778      
Employee Stock Incentive Plan 2005        
Stockholders Equity Note [Line Items]        
Number of shares available for grant (shares)       27,783,379
Share-based Compensation Arrangement by Share-based Payment Award, Weight Of Awarded Shares Against Authorized Maximum 1.9     1.5
2010 Purchase Plan | Maximum        
Stockholders Equity Note [Line Items]        
Maximum number of shares available 2,400,000      
Employee Stock Purchase Plan        
Stockholders Equity Note [Line Items]        
Total unamortized compensation cost | $ $ 2,100      
Weighted average period of total unamortized cost 4 months 24 days      
Stock-based compensation expense | $ $ 5,600 $ 5,400 $ 2,700  
Monthly Vesting | Stock Options | Incentive Plan 2005        
Stockholders Equity Note [Line Items]        
Stock incentive plan, vesting percentage 2.08%