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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 87,226 $ 70,606 $ 146,002 $ 165,538
Net gain on asset disposals 3,091 [1] 1,033 [1] 4,835 [1] 908 [1]
Interest income 208 250 384 423
Interest expense (7,249) (6,941) (14,437) (13,707)
Other 3 381 3 400
Income before income taxes 80,188 64,296 131,952 152,654
Operating Segments
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 98,159 82,850 169,482 190,155
Operating Segments | Contract Drilling
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 69,617 47,069 136,694 119,618
Operating Segments | Pressure Pumping
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 24,910 30,254 26,453 58,769
Operating Segments | Oil and Natural Gas
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 3,632 5,527 6,335 11,768
Operating Segments | Corporate and Other
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (14,024) $ (13,277) $ (28,315) $ (25,525)
[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.