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Share-Based Compensation - Schedule of Restricted Stock Units Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units and Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs Outstanding, Beginning Balance 5,655 6,545 7,254
RSUs and PSUs, Granted 1,856 1,769 2,725
Performance adjustment 206 227 1,250
RSUs and PSUs, Vested (2,394) (2,467) (4,123)
RSUs and PSUs, Cancelled (255) (419) (561)
RSUs and PSUs Outstanding, Ending Balance 5,068 5,655 6,545
Weighted Average Grant Date Fair Value, RSUs and PSUs, Beginning balance $ 105.23 $ 86.32 $ 72.05
Weighted Average Grant Date Fair Value, RSUs and PSUs, Granted 144.17 138.45 101.85
Performance adjustment 81.89 69.94 69.27
Weighted Average Grant Date Fair Value, RSUs and PSUs, Vested 88.63 75.97 67.33
Weighted Average Grant Date Fair Value, RSUs and PSUs, Cancelled 124.50 103.27 78.82
Weighted Average Grant Date Fair Value, RSUs and PSUs, Ending balance $ 125.40 $ 105.23 $ 86.32
Restricted Stock Units and Performance Stock Units [Member] | Time Based Stock Options and SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs Outstanding, Beginning Balance 2,620 3,123 3,465
RSUs and PSUs, Granted 1,048 973 1,464
RSUs and PSUs, Vested (1,030) (1,216) (1,487)
RSUs and PSUs, Cancelled (162) (260) (319)
RSUs and PSUs Outstanding, Ending Balance 2,476 2,620 3,123
Restricted Stock Units and Performance Stock Units [Member] | Performance Based Stock Options and RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs Outstanding, Beginning Balance     227
RSUs and PSUs, Vested     (136)
RSUs and PSUs, Cancelled     (91)
Performance Shares PSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs Outstanding, Beginning Balance 3,035 3,422 3,562
RSUs and PSUs, Granted 808 796 1,261
Performance adjustment 206 227 1,250
RSUs and PSUs, Vested (1,364) (1,251) (2,500)
RSUs and PSUs, Cancelled (93) (159) (151)
RSUs and PSUs Outstanding, Ending Balance 2,592 3,035 3,422