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Summary of Operating Results from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Operating revenues from discontinued operations $ 1,104
Loss from discontinued operations before income taxes (576)
Income tax benefit 209
Loss from discontinued operations $ (367)