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Share-Based Payments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 8,177,000 $ 2,381,000 $ 13,237,000 $ 3,886,000  
Stock options granted       1,204,628    
Common stock, shares issued   37,401,576   37,401,576   37,100,513
Performance-Based Stock Option Grants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 0    
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to stock option   $ 1,800,000   $ 1,800,000    
Weighted-average period to recognize compensation expense       1 year 9 months 18 days    
Fair value granted amount   1,800,000   $ 1,800,000    
Restricted stock units granted     0 15,000 0  
Stock-based compensation expense   $ 200,000 $ 0 $ 300,000 $ 0  
2013 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for issuance   5,644,695   5,644,695    
Shares available for future issuance   931,890   931,890    
Shares authorized for issuance 1,484,020          
Weighted-average grant date fair value of options   $ 64.19 $ 27.84 $ 67.57 $ 23.64  
Intrinsic value of options exercised   $ 11,300,000 $ 10,700,000 $ 29,400,000 $ 34,800,000  
Unrecognized compensation expense related to stock option   93,800,000   $ 93,800,000    
Weighted-average period to recognize compensation expense       3 years 2 months 12 days    
2013 Stock Incentive Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock       2,000,000    
Common stock outstanding       4.00%    
2013 Stock Incentive Plan [Member] | Performance-Based Stock Option Grants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to stock option   1,100,000   $ 1,100,000    
Stock-based compensation expense   $ 100,000 $ 100,000 $ 300,000 $ 100,000  
Stock options granted   0 0 0 0  
2013 Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares issued   10,664   10,664    
Purchase price interest rate stock option       85.00%    
Opportunity to purchase of common stock       327,272    
Stock Based Compensation expense   $ 100,000 $ 0 $ 100,000 $ 0