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Business Segments - Capital Expenditures (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Capital expenditures $ 662,461 $ 973,988 $ 1,011,578
Operating Segments | Contract Drilling
     
Segment Reporting Information [Line Items]      
Capital expenditures 504,508 744,949 784,686
Operating Segments | Pressure Pumping
     
Segment Reporting Information [Line Items]      
Capital expenditures 122,782 194,117 198,061
Operating Segments | Oil and Natural Gas
     
Segment Reporting Information [Line Items]      
Capital expenditures 31,245 29,888 22,884
Corporate and other
     
Segment Reporting Information [Line Items]      
Capital expenditures $ 3,926 $ 5,034 $ 5,947