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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 400,764 $ 281,652 $ 823,862 $ 703,928
Corporate        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 1,761 1,879 5,338 5,997
Operating Segments | Contract Drilling        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 296,119 179,979 554,838 441,834
Operating Segments | Pressure Pumping        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 72,139 76,986 188,459 191,370
Operating Segments | Directional Drilling        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 20,518 12,263 41,755 35,039
Other Operations        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 10,227 $ 10,545 $ 33,472 $ 29,688