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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (329,515) $ 30,291 $ (330,176) $ 176,293
Net gain on asset disposals [1] 1,362 3,870 7,276 8,705
Interest income 323 234 924 618
Interest expense, net of amount capitalized (9,254) (6,993) (27,044) (21,430)
Other 16   16 3
Income (loss) before income taxes (338,430) 23,532 (356,280) 155,484
Operating Segments        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (316,544) 40,357 (292,933) 209,839
Operating Segments | Contract Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (131,256) 12,147 (65,692) 148,841
Operating Segments | Pressure Pumping        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (183,464) 25,208 (217,224) 51,661
Operating Segments | Oil And Natural Gas        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (1,824) 3,002 (10,017) 9,337
Corporate and other        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (14,333) $ (13,936) $ (44,519) $ (42,251)
[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.