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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 194,862 | $ 118,350 | $ 317,783 | $ 186,790
Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 7,311 | 8,017 | 16,707 | 12,369
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 227 | 227 | 753 | 681
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 121,095 | 71,326 | 196,342 | 115,547
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | 56,195 | $ 38,780 | 81,118 | $ 58,193
Operating Segments | Directional Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 10,034 |  | $ 22,863 |

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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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