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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 88,594 $ 132,294 $ 397,152 $ 381,701
Net gain on asset disposals 1,963 [1] 1,437 [1] 32,695 [1] 4,058 [1]
Interest income 149 47 382 135
Interest expense (7,207) (3,835) (16,840) (11,238)
Other income 624 375 535 572
Income from continuing operations before income taxes 82,160 128,881 381,229 371,170
Operating Segments
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 98,411 140,888 399,093 410,207
Operating Segments | Contract Drilling
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 77,967 85,708 280,274 251,362
Operating Segments | Pressure Pumping
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 15,009 50,426 98,642 142,144
Operating Segments | Oil and Natural Gas
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 5,435 4,754 20,177 16,701
Corporate and other
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (11,780) $ (10,031) $ (34,636) $ (32,564)
[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.