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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | $ 916,318 | $ 783,341 | $ 668,434
Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | 41,512 | 29,402 | 10,114
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | 7,872 | 7,695 | 5,474
Operating Segments | Contract Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | 571,607 | 538,891 | 467,974
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | 250,010 | 198,006 | $ 184,872
Operating Segments | Directional Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion, amortization and impairment | $ 45,317 | $ 9,347 |

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