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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 145,481 | $ 347,512 | $ 641,458
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 1,707 | 4,612 | 2,426
Operating Segments | Contract Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 105,037 | 194,416 | 394,595
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 21,678 | 105,803 | 173,848
Operating Segments | Directional Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 4,681 | 15,549 | 35,929
Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 12,378 | $ 27,132 | $ 34,660

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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=121586364&loc=d3e3213-108585 + Details
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