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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, 2012
Mar. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ 157,664 $ 117,547
Net gain on asset disposals 2,400 [1] 1,604 [1]
Interest income 54 43
Interest expense (4,582) (3,889)
Other 55 119
Income from continuing operations before income taxes 153,191 113,820
Operating Segments
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 166,076 126,715
Operating Segments | Contract Drilling
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 111,771 80,519
Operating Segments | Pressure Pumping
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 46,787 41,378
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) 7,518 4,818
Corporate and other
    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income (loss) $ (10,812) $ (10,772)
[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.