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Summary of Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans Beginning balance	705,345	1,388,514	1,487,331
Incentive Stock Option Plans Options granted			20,000
Incentive Stock Option Plans, Option exercised	(126,149)	(659,733)	(48,000)
Incentive Stock Option Plans, Option expired or forfeited	(18,167)	(23,436)	(70,817)
Incentive Stock Option Plans, Ending balance	561,029	705,345	1,388,514
Weighted Average Price Per Share, Beginning balance	$ 7.70	$ 7.44	$ 7.65
Weighted Average Price Per Share, Option granted			$ 12.28
Weighted Average Price Per Share, Option exercised	$ 7.50	$ 7.05	$ 8.63
Weighted Average Price Per Share, Option expired or forfeited	$ 7.50	$ 10.41	$ 12.38
Weighted Average Price Per Share, Ending balance	$ 7.76	$ 7.70	$ 7.44
Exercisable Weighted Average Price Per Share, Beginning balance	$ 7.95	$ 7.26	$ 7.77
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.70	$ 7.95	$ 7.26
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Lower Range			$ 11.32
Options exercised, Lower Range		$ 3.67	$ 8.10
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Upper Range			$ 13.24
Options exercised, Upper Range		$ 14.99	$ 11.30

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Share Based Compensation, Shares Authorized under Stock Option Plans, Grants in Period, Exercise Price Range, Lower Range Limit

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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

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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