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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 29 days    
Unrecognized compensation cost related to unvested share-based equity awards $ 90,990    
Weighted average period of recognition of unvested share-based equity awards (in years) 1 year 7 months 15 days    
Unrecognized compensation cost related to unvested share-based equity awards, Stock Options $ 36,622    
Unrecognized compensation cost related to unvested share-based equity awards, Restricted Stock $ 54,368    
Weighted average remaining contractual life of option outstanding 6 years 6 months 27 days    
Estimated weighted average fair value of options granted $ 37.64 $ 39.97 $ 30.43
Total intrinsic value of options exercised $ 77,951    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 82,276    
Total intrinsic value of options outstanding and exercisable $ 77,110    
Omnibus Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted, vesting period 2 years    
Omnibus Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted, vesting period 4 years    
Omnibus Incentive Plan | Deferred Stock Units | Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares granted 8,000 9,000 12,000
Omnibus Incentive Plan | Deferred Stock Units | Non-employee directors | Since 2007      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares granted 146,000    
Stock Option Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares granted 743,062 705,564 1,037,729
Stock Option Plans | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted, vesting period 3 years    
Stock Option Plans | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted, expiration period 10 years    
Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares authorized for issuance 500,000    
Shares of common stock earned 107,000    
Additional shares issued to retired directors 383,000    
Liabilities under share plan $ 9,167 $ 15,217  
Long Term Incentive Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liabilities under share plan 0    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of restricted stock expected to vest $ 65,775    
Weighted average fair values at the grant dates of grants awarded $ 139.50 $ 134.34 $ 88.84