Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Income Taxes    
Estimated tax liabilities, gain on sale of discontinued operations $ 478,000 $ 999,000