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Summary of Operating Results from Discontinued Operations (Detail) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues from discontinued operations	$ 1,104	$ 3,737
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
Drilling and completion fluids revenues
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues from discontinued operations		$ 3,737

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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