Shareholders' Equity - Summary of Information about Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Number of shares
Outstanding Beginning Balance	18,524,303
Options granted	3,008,200
Options exercised	(1,462,188)
Options forfeited	(474,851)
Options canceled	(221,863)
Outstanding Ending Balance	19,373,601
Exercisable at December 31, 2014	9,521,129
Weighted average exercise price per share
Outstanding Beginning Balance	$ 41.02
Options granted	$ 42.47
Options exercised	$ 31.10
Options forfeited	$ 41.67
Options cancelled	$ 45.35
Outstanding Ending Balance	$ 41.92
Exercisable at December 31, 2014	$ 42.48
Weighted average remaining contractual life
Outstanding at December 31, 2014	5 years 9 months 7 days
Exercisable at December 31, 2014	3 years 5 months 17 days
Aggregate intrinsic value
Outstanding at December 31, 2014	$ 77,856
Exercisable at December 31, 2014	$ 35,127

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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.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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