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Gain (loss) on Disposition of Assets, Net - Additional Information (Detail) $ in Thousands | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Vehicle | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |
Number of ROVs disposed | Vehicle |  | 8 |  |  |
Gain on dispositions of assets | $ 3,561 | $ 6,616 |  | $ 2,263 | $ 10,624
Amortized gains on sale/leaseback transactions | $ 3,000 |  |  |  |
Unamortized deferred gains credited to reorganization items on account of lease rejections |  |  | $ 105,900 |  |
ROVs |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |
Gain on dispositions of assets |  | $ 7,100 |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108788860&loc=d3e50609-112754 + Details
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