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Business Segments - Income Before Income Taxes (Detail) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 131,860 $ 45,757 $ 249,407 $ 53,588
Net gain on asset disposals 1,017 [1] 21,939 [1] 2,621 [1] 21,690 [1]
Interest income 45 1,380 88 1,567
Interest expense (3,514) (1,383) (7,403) (2,784)
Other 78 174 197 249
Income from continuing operations before income taxes 128,469 45,928 242,289 52,620
Operating Segments
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 142,604 31,732 269,319 47,727
Operating Segments | Contract Drilling
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 85,135 22,099 165,654 30,800
Operating Segments | Pressure Pumping
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 50,340 6,706 91,718 11,183
Operating Segments | Oil and Natural Gas
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 7,129 2,927 11,947 5,744
Significant Reconciling Items
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (11,761) $ (7,914) $ (22,533) $ (15,829)
[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.