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Summary of Option Activity (Detail) - Incentive Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	626,845	724,904	561,029
Incentive Stock Option Plans, Option granted	0	0	277,025
Incentive Stock Option Plans, Option exercised	(58,900)	(63,950)	(113,150)
Incentive Stock Option Plans, Option forfeited	(26,040)	(34,109)
Incentive Stock Option Plans, Ending balance	541,905	626,845	724,904
Weighted Average Price Per Share, Beginning balance	$ 9.25	$ 9.22	$ 7.76
Weighted Average Price Per Share, Option granted			11.49
Weighted Average Price Per Share, Option exercised	7.50	7.50	7.50
Weighted Average Price Per Share, Option forfeited	11.49	12.00
Weighted Average Price Per Share, Ending balance	9.33	9.25	9.22
Exercisable Weighted Average Price Per Share, Beginning balance	7.73	7.82	7.70
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.97	$ 7.73	$ 7.82

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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