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Stock Option Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options, Outstanding at beginning of year	13,142
Options, Granted	2,048
Options, Exercised	(6,041)
Options, Forfeited	(607)
Options, Outstanding at December 31, 2018	8,542
Options, Exercisable at December 31, 2018	4,007
Weighted average exercise price, Outstanding at beginning of year	$ 75.97
Weighted average exercise price, Granted	109.26
Weighted average exercise price, Exercised	59.16
Weighted average exercise price, Forfeited	84.15
Weighted average exercise price, Outstanding at December 31, 2018	95.26
Weighted average exercise price, Exercisable at December 31, 2018	$ 87.37
Aggregate intrinsic value, Outstanding	$ 101,203	$ 381,022
Aggregate intrinsic value, Exercisable as of December 31, 2018	$ 70,507

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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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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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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 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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