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Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, Beginning Balance, Shares	363,896
Exercised, Shares	(47,343)
Forfeited or Expired, Shares	(27,086)
Options outstanding, Ending Balance, Shares	289,467
Options outstanding, Beginning Balance, Weighted Average Exercise Price	$ 22.03
Exercised, Weighted Average Exercise Price	$ 19.48
Forfeited or Expired, Weighted Average Exercise Price	$ 28.28
Options outstanding, Ending Balance, Weighted Average Exercise Price	$ 21.87
Options outstanding, Beginning Balance, Options Exercisable	276,009
Options outstanding, Ending Balance, Options Exercisable	287,467

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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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For presentations that combine terminations, 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 or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 718

-SubTopic 10

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-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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

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-Number 210

-Section 04

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