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Business Segments - Depreciation, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 196,642 $ 163,464 $ 572,187 $ 511,209
Other Operations        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 9,534 1,856 19,826 8,393
Corporate        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 2,231 1,369 5,456 4,106
Operating Segments | Contract Drilling        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 133,603 115,652 405,576 357,153
Operating Segments | Pressure Pumping        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 51,274 $ 44,587 $ 141,329 $ 141,557