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Equity - Schedule of Ordinary Shares Issued Upon Vested Options (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
yr
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 24,086
Weighted average exercise price $ 46.89
Weighted average remaining life Years | yr 5.30
Aggregate intrinsic value (in millions) | $ [1]
$15.01 - $25.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 548
Weighted average exercise price $ 16.99
Weighted average remaining life Years | yr 8.68
Aggregate intrinsic value (in millions) | $ [1]
Range of exercise prices, lower limit $ 15.01
Range of exercise prices, upper limit $ 25.00
$25.01 - $35.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 2,464
Weighted average exercise price $ 34.60
Weighted average remaining life Years | yr 8.18
Range of exercise prices, lower limit $ 25.01
Range of exercise prices, upper limit $ 35.00
$35.01 - $45.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 6,655
Weighted average exercise price $ 40.59
Weighted average remaining life Years | yr 3.55
Range of exercise prices, lower limit $ 35.01
Range of exercise prices, upper limit $ 45.00
$45.01 - $55.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 10,041
Weighted average exercise price $ 50.17
Weighted average remaining life Years | yr 5.17
Range of exercise prices, lower limit $ 45.01
Range of exercise prices, upper limit $ 55.00
$55.01 - $65.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 4,369
Weighted average exercise price $ 59.58
Weighted average remaining life Years | yr 6.25
Range of exercise prices, lower limit $ 55.01
Range of exercise prices, upper limit $ 65.00
$65.01 - $70.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Balance at end of period (in thousands) Number of shares | shares 9
Weighted average exercise price $ 66.85
Weighted average remaining life Years | yr 0.03
Range of exercise prices, lower limit $ 65.01
Range of exercise prices, upper limit $ 70.00
[1] Represents an amount less than 0.5 million.