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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Increase in goodwill | $ 2,100,000 |  |
Goodwill impairment charge | 17,800,000 | $ 211,129,000 |
Cost incurred to renew or extend term of intangible asset | 0 | 0 |
Impairment | 0 | 0 |
Amortization expense on intangible assets | 17,900,000 | 18,300,000 | $ 24,300,000
Contract Drilling |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Accumulated impairment losses | $ 0 | $ 0 |
Percentage fair value exceeds carrying values | 13.00% | 16.00% |
Goodwill impairment charge | $ 0 | $ 0 |
Other Operations |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Accumulated impairment losses | 0 | $ 0 |
Goodwill impairment charge | 17,800,000 |  |
Oilfield Rentals and Electrical Controls and Automation Reporting Unit |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Goodwill impairment charge | $ 17,800,000 |  |
Oilfield Rental |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Percentage fair value exceeds carrying values |  | 14.00% |
Goodwill impairment charge |  | $ 0 |
Pressure Pumping and Directional Drilling |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |
Goodwill impairment charge |  | $ 211,000,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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