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Business Segments - Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and natural gas $ 12,116 $ 14,717 $ 24,120 $ 31,502
Total operating revenues 757,276 659,316 1,435,444 1,326,355
Contract Drilling
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 438,583 389,979 864,486 809,073
Pressure Pumping
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 306,577 254,620 546,838 485,780
Operating Segments
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and natural gas 12,116 14,717 24,120 31,502
Total operating revenues 758,720 660,549 1,437,947 1,328,727
Operating Segments | Contract Drilling
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 440,027 391,212 866,989 811,445
Operating Segments | Pressure Pumping
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Oil and gas services 306,577 254,620 546,838 485,780
Intersegment Elimination
        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total operating revenues $ (1,444) [1] $ (1,233) [1] $ (2,503) [1] $ (2,372) [1]
[1] Consists of contract drilling intercompany revenues for drilling services provided to the oil and natural gas exploration and production segment.