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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 162,785 | $ 143,061 | $ 480,568 | $ 329,851
Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 6,817 | 8,647 | 23,524 | 21,016
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 958 | 305 | 1,711 | 986
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 103,295 | 106,879 | 299,637 | 222,426
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 44,860 | $ 27,230 | 125,978 | $ 85,423
Operating Segments | Directional Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 6,855 |  | $ 29,718 |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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