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Summary of Option Activity (Detail)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance | shares	626,845
Incentive Stock Option Plans, Option exercised | shares	(25,500)
Incentive Stock Option Plans, Option forfeited | shares	(9,813)
Incentive Stock Option Plans, Ending balance | shares	591,532
Weighted Average Price Per Share, Beginning balance	$ 9.25
Weighted Average Price Per Share, Option exercised	7.50
Weighted Average Price Per Share, Option forfeited	11.49
Weighted Average Price Per Share, Ending balance	9.29
Exercisable Weighted Average Price Per Share, Beginning balance	7.73
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.84
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance | shares	98,410
Incentive Stock Option Plans, Option forfeited | shares	(8,946)
Incentive Stock Option Plans, Ending balance | shares	89,464
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

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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

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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Number of share options (or share units) exercised during the current period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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