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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, 2014
Mar. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ 58,776 $ 94,932
Net gain on asset disposals 1,744 [1] (125) [1]
Interest income 176 173
Interest expense (7,188) (6,766)
Other   19
Income before income taxes 51,764 88,358
Operating Segments
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 71,323 107,305
Operating Segments | Contract Drilling
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 67,077 72,549
Operating Segments | Pressure Pumping
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 1,543 28,515
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 2,703 6,241
Corporate and other
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ (14,291) $ (12,248)
[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.