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Share-Based Compensation - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based equity awards $ 61,414,000    
Weighted average period of recognition of unvested share-based equity awards (in years) 1 year 5 months 24 days    
Unrecognized compensation cost related to unvested share-based equity awards, Stock Options 34,037,000    
Unrecognized compensation cost related to unvested share-based equity awards, Restricted Stock 27,377,000    
Weighted average remaining contractual life of option outstanding 6 years 11 months 24 days    
Estimated weighted average fair value of options granted $ 30.43 $ 23.40 $ 18.44
Total intrinsic value of options exercised 86,101,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 450,108,000    
Total intrinsic value of options outstanding and exercisable 186,391,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 5 months 24 days    
Omnibus Incentive Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares of common stock available for issuance 13,500,000    
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 12,000 12,000 16,000
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 129,000    
Stock Option Plans
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares granted 1,037,729 570,700 1,276,500
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    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair values at the grant dates of grants awarded $ 88.84 $ 70.12 $ 42.54
Total intrinsic value of restricted stock expected to vest 96,828,000    
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 117,000    
Additional shares issued to retired directors 357,000    
Liabilities under share plan 17,031,000 19,699,000  
Long Term Incentive Plans
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liabilities under share plan $ 57,166,000 $ 66,586,000