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Business Segments - Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]      
Oil and natural gas $ 57,257 $ 59,930 $ 50,559
Total operating revenues 2,716,034 2,723,414 2,565,943
Operating Segments
      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Oil and natural gas 57,257 59,930 50,559
Total operating revenues 2,721,301 2,728,220 2,569,991
Operating Segments | Contract Drilling
      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Oil and gas services 1,684,878 1,826,519 1,673,629
Operating Segments | Pressure Pumping
      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Oil and gas services 979,166 841,771 845,803
Intersegment Elimination
      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total operating revenues $ (5,267) [1] $ (4,806) [1] $ (4,048) [1]
[1] Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.