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Shared-based Compensation (Schedule of Share Based Compensation Stock Options Activity) (Detail) - Stock Option [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance	129	98
Shares, Granted	38	50
Shares, Exercised	(27)	(12)
Shares, Forfeited	(31)	(6)
Shares, Expired	(3)	(1)
Shares, Outstanding Ending Balance	106	129
Shares, Exerciseable	54	49
Weighted-Average Exercise Price, Outstanding Beginning Balance	$ 28.22	$ 28.17
Weighted-Average Exercise Price, Granted	44.73	27.99
Weighted-Average Exercise Price, Exercised	27.34	25.64
Weighted-Average Exercise Price, Forfeited	38.64	29.87
Weighted-Average Exercise Price, Expired	30.13	31.55
Weighted-Average Exercise Price, Oustanding Ending Balance	31.18	28.22
Weighted-Average Exercise Price, Exerciseable	$ 28.15	$ 27.45

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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.

+ 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)(iii)
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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.

+ References

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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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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Gross number of share options (or share units) granted during the period.

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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 of the plan that expired.

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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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