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Summary of Option Activity (Detail) - Incentive Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	541,905	626,845	724,904
Incentive Stock Option Plans, Option exercised	(55,979)	(58,900)	(63,950)
Incentive Stock Option Plans, Option forfeited	(13,143)	(26,040)	(34,109)
Incentive Stock Option Plans, Ending balance	472,783	541,905	626,845
Weighted Average Price Per Share, Beginning balance	$ 9.33	$ 9.25	$ 9.22
Weighted Average Price Per Share, Option exercised	8.37	7.50	7.50
Weighted Average Price Per Share, Option forfeited	11.49	11.49	12.00
Weighted Average Price Per Share, Ending balance	9.38	9.33	9.25
Exercisable Weighted Average Price Per Share, Beginning balance	7.97	7.73	7.82
Exercisable Weighted Average Price Per Share, Ending balance	$ 9.38	$ 7.97	$ 7.73

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iii)
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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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