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Business Segments - Income Before Income Taxes (Detail) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)$ 132,294$ 52,509$ 381,701$ 106,097
Net gain on asset disposals1,437[1]250[1]4,058[1]21,940[1]
Interest income47641351,631
Interest expense(3,835)(6,227)(11,238)(9,011)
Other375260572509
Income from continuing operations before income taxes128,88146,606371,17099,226
Operating Segments
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)140,88861,530410,207109,257
Operating Segments | Contract Drilling
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)85,70841,479251,36272,279
Operating Segments | Pressure Pumping
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)50,42617,586142,14428,769
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)4,7542,46516,7018,209
Significant Reconciling Items
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss)$ (10,031)$ (9,271)$ (32,564)$ (25,100)
[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.