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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

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