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Earnings Per Share Data ("EPS") and Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 7,600,000 3,000,000 5,300,000 4,400,000
Stock options granted during period (net of cancellations)     2,479,278  
Weighted-average grant date fair value, per share     $ 28.17  
Compensation cost recognized     $ 34,716,000 $ 29,053,000
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost recognized, pre-tax charge $ 13,600,000 $ 13,000,000 32,500,000 27,900,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost recognized, pre-tax charge 1,200,000 $ 448,000 1,700,000 $ 599,000
Unrecognized compensation cost $ 141,000,000   $ 141,000,000  
Unrecognized compensation cost vesting period 2 years 10 months 24 days      
Restricted shares granted during period (net of cancellations)     136,446,000  
Weighted-average grant date fair value, per share     $ 119.44  
Unvested Stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 141,000,000   $ 141,000,000  
Unrecognized compensation cost vesting period 2 years 10 months 24 days