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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 437,279 $ 333,493 $ 289,847
Operating Segments | Contract Drilling
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 344,312 280,458 248,424
Operating Segments | Pressure Pumping
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 73,279 40,724 27,589
Operating Segments | Oil and Natural Gas
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 16,962 10,950 12,927
Corporate and other
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 2,726 $ 1,361 $ 907