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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 157,319 $ 400,764 $ 517,201 $ 823,862
Corporate        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 1,488 1,761 4,987 5,338
Operating Segments | Contract Drilling        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 102,275 296,119 328,843 554,838
Operating Segments | Pressure Pumping        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 37,104 72,139 118,586 188,459
Operating Segments | Directional Drilling        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment 9,600 20,518 29,698 41,755
Other Operations        
Segment Reporting Information [Line Items]        
Depreciation, depletion, amortization and impairment $ 6,852 $ 10,227 $ 35,087 $ 33,472