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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | $ 214,410 | $ 209,892
Corporate |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 1,803 | 2,237
Operating Segments | Contract Drilling |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 130,317 | 130,917
Operating Segments | Pressure Pumping |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 60,135 | 56,522
Operating Segments | Directional Drilling |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | 10,367 | 10,902
Other Operations |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion, amortization and impairment | $ 11,788 | $ 9,314

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