XML 17 R48.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Operating Results from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating revenues from discontinued operations $ 1,104 $ 9,449 $ 79,786
Loss from discontinued operations before income taxes (576) (1,499) (6,538)
Income tax benefit 209 543 2,208
Loss from discontinued operations (367) (956) (4,330)
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 79,786
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