XML 46 R35.htm IDEA: XBRL DOCUMENT v3.5.0.2
Share-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
May 31, 2016
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option awards granted 45,000          
Options outstanding, shares 935,000   935,000     896,000
Stock options vested 150,000          
Aggregate fair value of stock option vested $ 8,300,000          
Weighted average grant date fair value of stock option awards $ 75.54 $ 73.23        
Unrecognized share-based compensation expense $ 36,000,000   $ 36,000,000      
Unrecognized compensation expense expected to be recognized     2 years 7 months 6 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 $ 3,600,000 $ 4,400,000 5,100,000 8,000,000    
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 1,500,000
2013 Plan | Class A | Employees, Officers, and Directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option awards granted 45,000          
Options outstanding, shares 935,000   935,000      
Remaining shares of class A common stock authorized for future issuance 557,500   557,500