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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | $ 209,892 | $ 156,217
Other Operations |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 9,314 | 2,172
Corporate |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 2,237 | 1,236
Operating Segments | Contract Drilling |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 130,917 | 110,559
Operating Segments | Pressure Pumping |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 56,522 | $ 42,250
Operating Segments | Directional Drilling |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | $ 10,902 |

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