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Summary of Operating Results from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating revenues from discontinued operations   $ 1,104 $ 9,449
Loss from discontinued operations before income taxes   (576) (1,499)
Income tax benefit   209 543
Loss from discontinued operations    (367) (956)
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
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 $ 5,712