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Equity - Schedule of Ordinary Shares Issued Upon Vested Options (Detail) shares in Thousands | 12 Months Ended
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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.

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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + References No definition available. + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References No definition available. + Details
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- Definition The weighted average remaining life of the exercisable stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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