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Summary and Changes in Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding, Beginning Balance	6,112	5,507	5,750
Granted	1,807	1,077	1,159
Exercised	(1,353)	(341)	(1,315)
Canceled	(210)	(131)	(87)
Outstanding, Ending Balance	6,356	6,112	5,507
Weighted average exercise price
Outstanding, Beginning Balance	$ 20.01	$ 15.63	$ 9.31
Granted	46.55	40.19	37.21
Exercised	10.41	7.60	5.01
Canceled	43.05	34.35	46.08
Outstanding, Ending Balance	$ 28.83	$ 20.01	$ 15.63

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

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

+ References

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-Publisher FASB
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- Definition

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

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