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Summary of Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	724,904	561,029	705,345
Incentive Stock Option Plans, Options granted		277,025
Weighted Average Price Per Share, Options granted		$ 11.49
Incentive Stock Option Plans, Options exercised	(63,950)	(113,150)	(126,149)
Incentive Stock Option Plans, Option forfeited	(34,109)		(18,167)
Incentive Stock Option Plans, Ending balance	626,845	724,904	561,029
Weighted Average Price Per Share, Beginning balance	$ 9.22	$ 7.76	$ 7.70
Weighted Average Price Per Share, Options exercised	7.50	7.50	7.50
Weighted Average Price Per Share, Option forfeited	12.00		7.50
Weighted Average Price Per Share, Ending balance	9.25	9.22	7.76
Exercisable Weighted Average Price Per Share, Beginning balance	7.82	7.70	7.95
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.73	$ 7.82	$ 7.70
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	107,689
Incentive Stock Option Plans, Option forfeited	(9,279)
Incentive Stock Option Plans, Ending balance	98,410	107,689
Weighted Average Price Per Share, Beginning balance	$ 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.

+ 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
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-SubTopic 10
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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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