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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment $ 209,892 $ 156,217
Other Operations    
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment 9,314 2,172
Corporate    
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment 2,237 1,236
Operating Segments | Contract Drilling    
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment 130,917 110,559
Operating Segments | Pressure Pumping    
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment 56,522 $ 42,250
Operating Segments | Directional Drilling    
Segment Reporting Information [Line Items]    
Depreciation, depletion, amortization and impairment $ 10,902