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Summary of Stock Options Summarized by Exercise Price (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Exercise Price	$ 9.31	$ 9.31	$ 9.29	$ 9.25
Exercisable Weighted Average, Exercise Price	$ 7.87	$ 7.85	$ 7.84	$ 7.73
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	547,014
Outstanding Weighted Average, Remaining Life (Months)	70 months
Outstanding Weighted Average, Exercise Price	$ 9.31
Exercisable Weighted Average, Shares	328,857
Exercisable Weighted Average, Exercise Price	$ 7.87
Incentive Stock Option Plan | Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 7.50
Outstanding Weighted Average, Shares	303,350
Outstanding Weighted Average, Remaining Life (Months)	50 months
Outstanding Weighted Average, Exercise Price	$ 7.50
Exercisable Weighted Average, Shares	303,350
Exercisable Weighted Average, Exercise Price	$ 7.50
Incentive Stock Option Plan | Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	11.32
Exercise Price Per Share, Upper Range	$ 11.49
Outstanding Weighted Average, Shares	243,664
Outstanding Weighted Average, Remaining Life (Months)	95 months
Outstanding Weighted Average, Exercise Price	$ 11.57
Exercisable Weighted Average, Shares	25,507
Exercisable Weighted Average, Exercise Price	$ 12.28
Performance Incentive Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Remaining Life (Months)	15 months
Outstanding Weighted Average, Exercise Price	$ 11.49
Outstanding Weighted Average, Shares	82,334
Performance Incentive Stock Option | Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Remaining Life (Months)	15 months
Outstanding Weighted Average, Exercise Price	$ 11.49
Outstanding Weighted Average, Shares	82,334

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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 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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-Section 50
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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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-Name Accounting Standards Codification
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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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