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Summary of Option Activity (Detail) - $ / shares	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	660,573	697,854	724,904	724,904
Incentive Stock Option Plans, Option exercised	(4,000)	(34,800)	(16,650)
Incentive Stock Option Plans, Option forfeited	(22,582)	(2,481)	(10,400)
Incentive Stock Option Plans, Ending balance	633,991	660,573	697,854	633,991
Weighted Average Price Per Share, Beginning balance	$ 9.29	$ 9.21	$ 9.22	$ 9.22
Weighted Average Price Per Share, Option exercised	7.50	7.50	7.50
Weighted Average Price Per Share, Option forfeited	11.49	11.49	11.49
Weighted Average Price Per Share, Ending balance	9.25	9.29	9.21	9.25
Exercisable Weighted Average Price Per Share, Beginning balance	7.72	7.71	7.82	7.82
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.73	$ 7.72	$ 7.71	$ 7.73
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance			107,689	107,689
Incentive Stock Option Plans, Option forfeited				(9,279)
Incentive Stock Option Plans, Ending balance	98,410			98,410
Weighted Average Price Per Share, Beginning balance			$ 11.49	$ 11.49
Weighted Average Price Per Share, Option forfeited				11.49
Weighted Average Price Per Share, Ending balance	$ 11.49			$ 11.49

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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