Share-Based Compensation - Summary of the Status of Nonvested Stock Options (Detail) (USD $)	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Shares, beginning balance	833
Nonvested Shares, Granted	35,000
Nonvested Shares, vested	833
Nonvested shares, Forfeited or expired
Nonvested Shares, ending balance	35,000
Weighted Average Exercise Price per Share, beginning balance	$ 5.34
Weighted Average Exercise Price per Share, Granted	$ 5.39
Weighted Average Exercise Price per Share, vested	$ 5.34
Weighted Average Exercise Price per Share, forfeited or expired
Weighted Average Exercise Price per Share, Ending balance	$ 5.39

Share based compensation arrangement by share based payment award non vested options outstanding number.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award non vested options outstanding weighted average exercise price.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award options vested number.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award options vested weighted average exercise price.

+ References

No definition available.

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

For presentations that combine terminations, 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 or that expired.

+ References

+ Details

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- Definition

Weighted average price of options that were either forfeited or expired.

+ References

+ Details

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Period Type:	duration

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

+ Details

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