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Share-Based Compensation - Schedule of Restricted Stock Units Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 7,254 7,287 8,413
RSUs and PSUs, Granted 2,725 2,788 2,628
Performance adjustment 1,250    
RSUs and PSUs, Vested (4,123) (2,254) (3,112)
RSUs and PSUs, Cancelled (561) (567) (642)
RSUs and PSUs Outstanding, Ending Balance 6,545 7,254 7,287
Weighted Average Grant Date Fair Value, RSUs and PSUs, Beginning balance $ 72.05 $ 61.21 $ 51.15
Weighted Average Grant Date Fair Value, RSUs and PSUs, Granted 101.85 81.90 69.95
Performance adjustment 69.27    
Weighted Average Grant Date Fair Value, RSUs and PSUs, Vested 67.33 51.20 41.71
Weighted Average Grant Date Fair Value, RSUs and PSUs, Cancelled 78.82 64.06 59.66
Weighted Average Grant Date Fair Value, RSUs and PSUs, Ending balance $ 86.32 $ 72.05 $ 61.21
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 3,465 4,111 5,302
RSUs and PSUs, Granted 1,464 1,484 1,450
RSUs and PSUs, Vested (1,487) (1,824) (2,242)
RSUs and PSUs, Cancelled (319) (306) (399)
RSUs and PSUs Outstanding, Ending Balance 3,123 3,465 4,111
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 227 790 1,740
RSUs and PSUs, Vested (136) (430) (870)
RSUs and PSUs, Cancelled (91) (133) (80)
RSUs and PSUs Outstanding, Ending Balance   227 790
Performance Shares PSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PSUs Outstanding, Beginning Balance 3,562 2,386 1,371
RSUs and PSUs, Granted 1,261 1,304 1,178
Performance adjustment 1,250    
RSUs and PSUs, Vested (2,500)    
RSUs and PSUs, Cancelled (151) (128) (163)
RSUs and PSUs Outstanding, Ending Balance 3,422 3,562 2,386