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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 670,910 $ 1,003,873 $ 916,318
Corporate      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 6,494 6,888 7,872
Operating Segments | Contract Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 433,771 668,007 571,607
Operating Segments | Pressure Pumping      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 152,630 233,952 250,010
Operating Segments | Directional Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 36,504 52,223 45,317
Other Operations      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 41,511 $ 42,803 $ 41,512