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Summary of Option Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	561,029
Incentive Stock Option Plans, Option exercised	(82,650)
Incentive Stock Option Plans, Ending balance	478,379
Weighted Average Price Per Share, Beginning balance	$ 7.76
Weighted Average Price Per Share, Option exercised	$ 7.50
Weighted Average Price Per Share, Ending balance	$ 7.80
Exercisable Weighted Average Price Per Share, Beginning balance	$ 7.70
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.74

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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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