XML 25 R89.htm IDEA: XBRL DOCUMENT v2.4.0.6
Business Segments - Depreciation , Amortization And Improvement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 526,614 $ 437,279 $ 333,493
Operating Segments | Contract Drilling
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 390,316 344,312 280,458
Operating Segments | Pressure Pumping
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 111,062 73,279 40,724
Operating Segments | Oil and Natural Gas
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 21,417 16,962 10,950
Corporate and other
      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 3,819 $ 2,726 $ 1,361