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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |
Increase in goodwill |  |  | $ 2,104,000 |  |
Percentage fair value exceeds carrying value |  |  | 13.00% |  |
Goodwill impairment charge | $ 17,800,000 |  | $ 17,800,000 |  |
Amortization expense on intangible assets | 5,300,000 | $ 4,200,000 | 12,600,000 | $ 14,500,000 |
Contract Drilling |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |
Accumulated impairment losses | 0 |  | 0 |  | $ 0
Other Operations |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |
Increase in goodwill |  |  | 2,104,000 |  |
Accumulated impairment losses | 17,800,000 |  | 17,800,000 |  | $ 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 |  |  |  |

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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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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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