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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Capital expenditures | $ 122,921 | $ 68,440
Other Operations |  |
Segment Reporting Information [Line Items] |  |
Capital expenditures | 9,396 | 4,352
Corporate |  |
Segment Reporting Information [Line Items] |  |
Capital expenditures | 526 | 454
Operating Segments | Contract Drilling |  |
Segment Reporting Information [Line Items] |  |
Capital expenditures | 75,247 | 44,221
Operating Segments | Pressure Pumping |  |
Segment Reporting Information [Line Items] |  |
Capital expenditures | 24,923 | $ 19,413
Operating Segments | Directional Drilling |  |
Segment Reporting Information [Line Items] |  |
Capital expenditures | $ 12,829 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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