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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ 30,291 $ 124,551 $ 176,293 $ 290,089
Net gain on asset disposals 3,870 [1] 1,378 [1] 8,705 [1] 2,286 [1]
Interest income 234 293 618 716
Interest expense, net of amount capitalized (6,993) (7,503) (21,430) (21,210)
Other 0 380 3 780
Income before income taxes 23,532 117,721 155,484 270,375
Operating Segments
        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) 40,357 138,591 209,839 328,746
Operating Segments | Contract Drilling
        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) 12,147 116,253 148,841 235,871
Operating Segments | Pressure Pumping
        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) 25,208 16,917 51,661 75,686
Operating Segments | Oil and Natural Gas
        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) 3,002 5,421 9,337 17,189
Operating Segments | Corporate and Other
        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (13,936) $ (15,418) $ (42,251) $ (40,943)
[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.