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Summary of Stock Options Summarized by Exercise Price (Detail) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2013 Incentive Stock Option Plan	Sep. 30, 2013 Incentive Stock Option Plan Range One	Sep. 30, 2013 Incentive Stock Option Plan Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised, Lower Range	$ 7.50	$ 7.50	$ 7.50			$ 7.50	$ 11.32
Options exercised, Upper Range							$ 14.75
Outstanding Weighted Average, Shares					668,013	641,334	26,679
Outstanding Weighted Average, Remaining Life (Months)					83 months	83 months	83 months
Outstanding Weighted Average, Exercise Price	$ 7.72	$ 7.71	$ 7.71	$ 7.70	$ 7.72	$ 7.50	$ 12.90
Exercisable Weighted Average, Shares					159,346	139,334	20,012
Exercisable Weighted Average, Exercise Price	$ 8.20	$ 8.07	$ 7.96	$ 7.95	$ 8.20	$ 7.50	$ 13.10

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- Definition

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

+ References

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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)

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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

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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

-Publisher FASB

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-Topic 718

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-Section 50

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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

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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

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-Publisher FASB

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-Topic 718

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-Section 50

-Paragraph 2

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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

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