Summary of Stock Options Summarized by Exercise Price (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Exercise Price	$ 9.21	$ 9.22
Exercisable Weighted Average, Exercise Price	$ 7.71	$ 7.82
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	697,854
Outstanding Weighted Average, Remaining Life (Months)	87 months
Outstanding Weighted Average, Exercise Price	$ 9.21
Exercisable Weighted Average, Shares	421,229
Exercisable Weighted Average, Exercise Price	$ 7.71
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	404,550
Outstanding Weighted Average, Remaining Life (Months)	68 months
Outstanding Weighted Average, Exercise Price	$ 7.50
Exercisable Weighted Average, Shares	404,550
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	$ 14.75
Outstanding Weighted Average, Shares	293,304
Outstanding Weighted Average, Remaining Life (Months)	114 months
Outstanding Weighted Average, Exercise Price	$ 11.56
Exercisable Weighted Average, Shares	16,679
Exercisable Weighted Average, Exercise Price	$ 12.69
Performance Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	107,689
Outstanding Weighted Average, Remaining Life (Months)	33 months
Outstanding Weighted Average, Exercise Price	$ 11.49	$ 11.49
Performance Incentive Stock Option Plan \| Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 11.49
Outstanding Weighted Average, Shares	107,689
Outstanding Weighted Average, Remaining Life (Months)	33 months
Outstanding Weighted Average, Exercise Price	$ 11.49

Share based compensation by share based payment award option outstanding weighted average number of shares.

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- Definition

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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- Definition

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

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Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i)

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

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.

+ 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 (g)

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

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The ceiling 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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