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Summary of Operating Results from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Loss before income taxes | $ (576)
Income tax benefit | 209
Loss from discontinued operations, net of income tax | (367)
Electric wireline revenues |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Operating revenues from discontinued operations | $ 1,104

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