Shareholders' Equity - Summary of Information about Stock Options (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) $ / shares shares
Number of shares - Stock Option
Outstanding Beginning Balance \| shares	12,961
Options granted \| shares	0
Options exercised \| shares	(3,422)
Options forfeited \| shares	(152)
Options canceled \| shares	(34)
Outstanding Ending Balance \| shares	9,353
Exercisable at December 31, 2017 \| shares	6,570
Weighted average exercise price per share - Stock Option
Outstanding Beginning Balance \| $ / shares	$ 44.36
Options granted \| $ / shares	0.00
Options exercised \| $ / shares	43.68
Options forfeited \| $ / shares	45.68
Options cancelled \| $ / shares	43.36
Outstanding Ending Balance \| $ / shares	44.60
Exercisable at December 31, 2017 \| $ / shares	$ 43.89
Weighted average remaining contractual life - Stock Option
Outstanding at December 31, 2017	5 years 1 month 18 days
Exercisable at December 31, 2017	4 years 6 months 17 days
Aggregate intrinsic value - Stock Option
Outstanding at December 31, 2017 \| $	$ 219,719
Exercisable at December 31, 2017 \| $	$ 158,995

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Life [Abstract]

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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