Reconciliation of Basic and Diluted Per Share Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Basic
Net income	$ 1,205	$ 3,846
Weighted average shares outstanding	19,093	18,895
Basic earnings per common share	$ 0.06	$ 0.20
Diluted
Net income	$ 1,205	$ 3,846
Weighted average shares outstanding	19,093	18,895
Effect of dilutive securities
Weighted average common shares and potential dilutive shares	19,283	19,090
Diluted earnings per common share	$ 0.06	$ 0.20
Stock options
Effect of dilutive securities
Effect of dilutive securities		3
Restricted stock
Effect of dilutive securities
Effect of dilutive securities	190	192

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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-Number 210

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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

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-Name Regulation S-X (SX)

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-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Net Income

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A7

-Appendix A

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+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details