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Description of the frequency of periodic repurchases, which may be presented in a variety of ways (for example, monthly, quarterly, annually).

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Stock Repurchase Program, Cumulative Shares Repurchased, Value

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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No definition available.

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Number of share instruments newly issued under a share-based compensation plan.

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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 11, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate ordinary shares repurchase	$ 6,806,024,000
Shares repurchase, shares	9,535,992	12,298,434	12,032,899
Shares repurchase, value	$ 995,322,000	$ 987,897,000	$ 985,735,000
Total intrinsic value of options exercised	$ 95,707,000	$ 112,989,000	$ 131,603,000
Weighted average fair value granted under options	$ 25.00	$ 17.14	$ 22.39
Total fair value of restricted stock units vested	$ 35,824,000	$ 22,772,000	$ 22,485,000
Unrecognized compensation expense	$ 153,469,000
Unrecognized compensation expense expected period of recognition (in years)	1 year 10 months 2 days
Options to purchase ordinary shares reserved for issuance	15,903,000
Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount under share repurchase programs per quarter				$ 250,000,000
Authorized amount under share repurchase programs				$ 1,000,000,000
Shares repurchase, value	$ 995,322,000	$ 987,897,000	$ 985,735,000
Frequency of periodic stock repurchases	Quarter
Two Thousand Five Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum period options granted to employees, officers and directors (in years)	7 years
Reserved and Authorized Shares, percent of ordinary shares issued and outstanding at year end	10.00%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares issued	519,521
Percentage of salary to purchase Ordinary shares	15.00%
Ordinary shares per employee, maximum	1,250
Price of Ordinary shares purchased under ESPP, percentage of lower of fair market value of Ordinary share on subscription date of each offering period or on purchase date	85.00%
Purchase of Ordinary shares by employees	346,241	311,257	277,571
Average price per share purchased by employees	$ 73.47	$ 66.08	$ 60.99
Compensation expense recognized	$ 6,656,000	$ 5,432,000	$ 4,517,000
US ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase ordinary shares reserved for issuance	500,000
Rest of the World ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase ordinary shares reserved for issuance	1,000,000
Stock Options \| Two Thousand Five Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of stock units granted	$ 103.50	$ 80.73	$ 83.23
Restricted Stock Units (RSUs) \| Two Thousand Five Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Stock Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of stock units granted	$ 104.38	$ 82.01
Total fair value of restricted stock units vested	$ 6,241,000	$ 3,056,000	$ 1,523,000