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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) (USD $) In Thousands, except Share data, unless otherwise specified				6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2014 Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding	460,879	478,379	561,029	460,879
Number of Shares, Expected to Vest				460,879
Number of Shares, Exercisable				457,546
Weighted Average Exercise Price, Outstanding	$ 7.81	$ 7.80	$ 7.76	$ 7.81
Weighted Average Exercise Price, Expected to Vest				$ 7.81
Weighted Average Exercisable, Exercise Price	$ 7.77	$ 7.74	$ 7.70	$ 7.77
Weighted Average Remaining Life, Outstanding				77 months
Weighted Average Remaining Contractual Life, Expected to Vest				77 months
Weighted Average Remaining Contractual Life, Exercisable				77 months
Intrinsic Value, Outstanding				$ 2,503
Intrinsic Value, Expected to Vest				2,503
Intrinsic Value, Exercisable				$ 2,503

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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