Common Stock and Earnings Per Share - Details of Earnings Per Share Calculations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income - continuing operations	$ 1,850	$ 7,398	$ 4,262	$ 9,392
Net income (loss)-discontinued operations	(41)	(236)	333	(319)
Net income	$ 1,809	$ 7,162	$ 4,595	$ 9,073
Weighted average common shares outstanding
Basic	38,908	38,065	38,798	37,928
Incremental shares with dilutive effect:
Diluted	39,226	38,742	39,145	38,597
Basic income (loss) per share
Continuing operations	$ 0.05	$ 0.19	$ 0.11	$ 0.25
Discontinued operations	$ 0.00	$ (0.01)	$ 0.01	$ (0.01)
Total net income per share	$ 0.05	$ 0.18	$ 0.12	$ 0.24
Diluted income (loss) per share
Continuing operations	$ 0.05	$ 0.19	$ 0.11	$ 0.24
Discontinued operations	$ 0.00	$ (0.01)	$ 0.01	$ (0.01)
Total net income per share	$ 0.05	$ 0.18	$ 0.12	$ 0.23
Stock Options [Member]
Incremental shares with dilutive effect:
Stock options	199	524	199	530
Restricted Stock [Member]
Incremental shares with dilutive effect:
Stock options	118	153	148	139

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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- 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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-Publisher FASB

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-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

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-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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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

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

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