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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ 94,932 $ 157,664
Net gain (loss) on asset disposals (125) [1] 2,400 [1]
Interest income 173 54
Interest expense (6,766) (4,582)
Other 19 55
Income before income taxes 88,358 153,191
Operating Segments
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 107,305 166,076
Operating Segments | Contract Drilling
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 72,549 111,771
Operating Segments | Pressure Pumping
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 28,515 46,787
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 6,241 7,518
Corporate and other
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ (12,248) $ (10,812)
[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.