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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding	633,991	660,573	697,854	724,904
Weighted Average Exercise Price, Outstanding	$ 9.25	$ 9.29	$ 9.21	$ 9.22
Weighted Average Exercisable, Exercise Price	$ 7.73	$ 7.72	$ 7.71	$ 7.82
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding	633,991
Number of Shares, Expected to Vest	623,148
Number of Shares, Exercisable	378,429
Weighted Average Exercise Price, Outstanding	$ 9.25
Weighted Average Exercise Price, Expected to Vest	9.21
Weighted Average Exercisable, Exercise Price	$ 7.73
Weighted Average Remaining Life, Outstanding	82 months
Weighted Average Remaining Contractual Life, Expected to Vest	81 months
Weighted Average Remaining Contractual Life, Exercisable	62 months
Intrinsic Value, Outstanding	$ 1,489
Intrinsic Value, Expected to Vest	1,488
Intrinsic Value, Exercisable	1,471
Intrinsic Value, Outstanding	1,489
Intrinsic Value, Expected to Vest	1,488
Intrinsic Value, Exercisable	$ 1,471
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding	98,410			107,689
Number of Shares, Expected to Vest	54,692
Weighted Average Exercise Price, Outstanding	$ 11.49			$ 11.49
Weighted Average Exercise Price, Expected to Vest	$ 11.49
Weighted Average Remaining Life, Outstanding	27 months
Weighted Average Remaining Contractual Life, Expected to Vest	27 months
Intrinsic Value, Outstanding	$ 7
Intrinsic Value, Expected to Vest	4
Intrinsic Value, Outstanding	7
Intrinsic Value, Expected to Vest	$ 4

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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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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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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 weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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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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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