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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) $ 322,191 $ 497,361 $ 525,601
Net gain (loss) on asset disposals 3,384 [1] 33,806 [1] 4,999 [1]
Interest income 918 554 187
Interest expense (28,359) (22,750) (15,652)
Other 1,691 508 582
Income from continuing operations before income taxes 296,441 475,673 510,718
Operating Segments
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 373,454 509,398 563,505
Operating Segments | Contract Drilling
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 266,262 349,393 346,083
Operating Segments | Pressure Pumping
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 87,244 132,795 193,440
Operating Segments | Oil and Natural Gas
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) 19,948 27,210 23,982
Corporate and other
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income (loss) $ (54,647) $ (45,843) $ (42,903)
[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.