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Business Segments - Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and natural gas $ 13,827 $ 14,933 $ 45,329 $ 44,340
Total operating revenues 730,907 643,631 2,057,262 2,070,664
Operating Segments
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and natural gas 13,827 14,933 45,329 44,340
Total operating revenues 732,249 644,532 2,060,976 2,074,335
Operating Segments | Contract Drilling
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 459,213 447,636 1,270,658 1,400,137
Operating Segments | Pressure Pumping
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 259,209 181,963 744,989 629,858
Intercompany Elimination
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total operating revenues $ (1,342) [1] $ (901) [1] $ (3,714) [1] $ (3,671) [1]
[1] Consists of contract drilling intercompany revenues for drilling services provided to the oil and natural gas exploration and production segment.