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Share-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option awards granted 0        
Options outstanding, shares 915,000   915,000   935,000
Stock options vested 27,500        
Aggregate fair value of stock option vested $ 2,300,000        
Weighted average grant date fair value of stock option awards   $ 82.89      
Unrecognized share-based compensation expense 31,000,000   $ 31,000,000    
Unrecognized compensation expense expected to be recognized     2 years 3 months 18 days    
Increase in additional paid-in capital     $ 1,200,000 $ 1,000,000  
Deferred tax assets wrote off due to vested stock options not exercisable     1,700,000 0  
Decrease in additional-paid in capital     1,700,000 0  
Payments related to tax withholding for net-share settlement of share-based award     3,739,000 0  
2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense recognized $ 3,300,000 $ 4,500,000 8,400,000 12,500,000  
Payments related to tax withholding for net-share settlement of share-based award     3,700,000 0  
Adjustment to Additional paid in capital related to tax withholding for net-share settlement of share-based award     $ 3,700,000 $ 0  
2013 Plan | Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, stock authorized 1,700,000   1,700,000    
2013 Plan | Class A | Employees, Officers, and Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option awards granted 0        
Options outstanding, shares 915,000   915,000    
Remaining shares of class A common stock authorized for future issuance 577,500   577,500