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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			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding			478,379
Number of Shares, Expected to Vest			478,351
Number of Shares, Exercisable			471,712
Weighted Average Exercise Price, Outstanding	$ 7.80	$ 7.76	$ 7.80
Weighted Average Exercise Price, Expected to Vest			$ 7.80
Weighted Average Exercisable, Exercise Price	$ 7.74	$ 7.70	$ 7.74
Weighted Average Remaining Life, Outstanding			80 months
Weighted Average Remaining Contractual Life, Expected to Vest			80 months
Weighted Average Remaining Contractual Life, Exercisable			80 months
Intrinsic Value, Outstanding			$ 6,625
Intrinsic Value, Expected to Vest			6,625
Intrinsic Value, Exercisable			$ 6,563

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Share based compensation by share based payment award option outstanding weighted average number of shares.

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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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-Publisher FASB

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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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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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