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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 641,458 | $ 567,087 | $ 119,799
Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 34,660 | 31,547 | 6,116
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 2,426 | 1,884 | 1,591
Operating Segments | Contract Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 394,595 | 354,425 | 72,508
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 173,848 | 171,436 | $ 39,584
Operating Segments | Directional Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 35,929 | $ 7,795 |

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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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