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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 124,551 $ 88,594 $ 290,089 $ 397,152
Net gain (loss) on asset disposals 1,378 [1] 1,963 [1] 2,286 [1] 32,695 [1]
Interest income 293 149 716 382
Interest expense (7,503) (7,207) (21,210) (16,840)
Other 380 624 780 535
Income before income taxes 117,721 82,160 270,375 381,229
Operating Segments
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 138,591 98,411 328,746 399,093
Operating Segments | Contract Drilling
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 116,253 77,967 235,871 280,274
Operating Segments | Pressure Pumping
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 16,917 15,009 75,686 98,642
Operating Segments | Oil and Natural Gas
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 5,421 5,435 17,189 20,177
Corporate and other
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (15,418) $ (11,780) $ (40,943) $ (34,636)
[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.