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Equity - Schedule of Ordinary Shares Issued Upon Outstanding Options (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
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 48,393
Weighted average exercise price $ 38.62
Weighted average remaining life Years | yr 6.87
Aggregate intrinsic value (in millions) | $ $ 2.4
Lower than $15.01 [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 593
Weighted average exercise price $ 11.40
Weighted average remaining life Years | yr 8.85
Aggregate intrinsic value (in millions) | $ $ 2.4
Range of exercise prices, upper limit $ 15.01
$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 12,398
Weighted average exercise price $ 18.92
Weighted average remaining life Years | yr 9.13
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 9,615
Weighted average exercise price $ 34.63
Weighted average remaining life Years | yr 8.17
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 6,703
Weighted average exercise price $ 40.57
Weighted average remaining life Years | yr 3.58
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 12,908
Weighted average exercise price $ 50.84
Weighted average remaining life Years | yr 5.64
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 6,167
Weighted average exercise price $ 59.34
Weighted average remaining life Years | yr 6.30
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.