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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) $ 525,601 $ 200,925 $ (48,214)
Net (loss) gain on asset disposals 4,999 [1] 22,812 [1] (3,385) [1]
Interest income 187 1,674 381
Interest expense (15,652) (12,772) (4,148)
Other 582 927 426
Income (loss) from continuing operations before income taxes 510,718 190,754 (51,555)
Operating Segments
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 563,505 215,132 (9,252)
Operating Segments | Contract Drilling
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 346,083 140,483 (11,219)
Operating Segments | Pressure Pumping
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 193,440 62,194 1,017
Operating Segments | Oil and Natural Gas
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 23,982 12,455 950
Corporate and other
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) $ (42,903) $ (37,019) $ (35,577)
[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.