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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion, amortization and impairment | $ 144,037 | $ 173,085 | $ 296,919 | $ 359,882
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion, amortization and impairment | 1,492 | 1,491 | 2,994 | 3,499
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, amortization and impairment | 98,592 | 115,130 | 200,266 | 226,568
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, amortization and impairment | 31,740 | 38,811 | 69,125 | 81,482
Operating Segments | Directional Drilling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 6,594 | 9,677 | 13,091 | 20,098
Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion, amortization and impairment | $ 5,619 | $ 7,976 | $ 11,443 | $ 28,235

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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