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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 150,894 $ 131,860 $ 308,558 $ 249,407
Net gain on asset disposals 28,332 [1] 1,017 [1] 30,732 [1] 2,621 [1]
Interest income 179 45 233 88
Interest expense (5,051) (3,514) (9,633) (7,403)
Other (144) 78 (89) 197
Income from continuing operations before income taxes 145,878 128,469 299,069 242,289
Operating Segments
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 134,606 142,604 300,682 269,319
Operating Segments | Contract Drilling
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 90,536 85,135 202,307 165,654
Operating Segments | Pressure Pumping
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 36,846 50,340 83,633 91,718
Operating Segments | Oil and Natural Gas
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 7,224 7,129 14,742 11,947
Corporate and other
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (12,044) $ (11,761) $ (22,856) $ (22,533)
[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.