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Summary of Option Activity (Detail) - Incentive Stock Options - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	432,718	473,641	473,641
Incentive Stock Option Plans, Option exercised	(38,360)	(40,923)
Incentive Stock Option Plans, Ending balance	394,358	432,718	394,358
Weighted Average Price Per Share, Beginning balance	$ 9.19	$ 9.38	$ 9.38
Weighted Average Price Per Share, Option exercised	10.02	11.49
Weighted Average Price Per Share, Ending balance	9.12	9.19	9.12
Exercisable Weighted Average Price Per Share, Beginning balance	9.19	9.38	9.38
Exercisable Weighted Average Price Per Share, Ending balance	$ 9.12	$ 9.19	$ 9.12

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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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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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