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Earnings Per Share Data ("EPS") and Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anti-dilutive weighted average stock options excluded from computation of earnings per share 7,300,000 8,000,000 8,200,000 5,600,000
Stock options granted during period (net of cancellations)     2,454,515  
Weighted-average grant date fair value, per share     $ 28.18  
Compensation cost recognized     $ 50,645,000 $ 42,838,000
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost recognized, pre-tax charge $ 14,200,000 $ 13,100,000 46,700,000 41,000,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost recognized, pre-tax charge 1,400,000 $ 432,000 3,100,000 $ 1,000,000
Unrecognized compensation cost $ 126,600,000   $ 126,600,000  
Unrecognized compensation cost vesting period 2 years 8 months 12 days      
Restricted shares granted during period (net of cancellations)     138,970,000  
Weighted-average grant date fair value, per share     $ 119.47  
Unvested Stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 126,600,000   $ 126,600,000  
Unrecognized compensation cost vesting period 2 years 8 months 12 days