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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested share-based equity awards $ 91,538    
Weighted average period of recognition of unvested share-based equity awards (in years) 1 year 4 months 13 days    
Unrecognized compensation cost related to unvested share-based equity awards, Stock Options $ 22,841    
Unrecognized compensation cost related to unvested share-based equity awards, Restricted Stock $ 68,697    
Weighted average remaining contractual life of option outstanding 6 years 7 months 9 days    
Weighted average remaining contractual life of option exercisable 5 years 25 days    
Estimated weighted average fair value of options granted $ 19.54 $ 26.50 $ 18.45
Total intrinsic value of options exercised $ 5,136    
Total intrinsic value of options outstanding 73,730    
Total intrinsic value of options exercisable $ 35,503    
Weighted average fair values at the grant dates of grants awarded $ 96.38 $ 106.43 $ 82.14
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%    
Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares of common stock available for issuance 24,325,000    
Omnibus Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards granted, vesting period 1 year    
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 15,000 12,000 11,000
Additional shares issued to retired directors 14,000 10,000 11,000
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 196,000    
Stock Option Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares granted 1,460,602    
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 73,000    
Additional shares issued to retired directors 427,000    
Liabilities under share plan $ 11,035 $ 7,253  
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 125,000,000    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 545,365    
Total intrinsic value of restricted stock expected to vest $ 142,151    
Weighted average fair values at the grant dates of grants awarded $ 89.75 $ 114.42 $ 85.97