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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

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