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Discontinued Operations - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 20, 2010
Ambar Lone Star Fluid Services LLC
Jan. 27, 2011
Universal Wireline, Inc.
Dec. 31, 2010
Universal Wireline, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net cash provided by investing activities of discontinued operations $ 25,500,000 $ 42,638,000 $ (54,000) $ 42,638,000 $ 25,500,000  
Impairment of the assets to be disposed           $ 2,200,000