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Gain 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 ($) | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Number of ROVs disposed | Vessel |  | 8 |  |
Gain on dispositions of assets |  | $ 6,616 |  |
Net properties and equipment |  | 837,520 | $ 837,520 |
Unamortized deferred gains credited to reorganization items on account of lease rejections |  |  | $ 105,900 |
Date of petition for bankruptcy |  |  | May 17, 2017 |
ROVs |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Gain on dispositions of assets |  | 7,100 |  |
Net properties and equipment |  | 15,700 | $ 15,700 |
Other Operating Revenues | Subsea Business |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Revenues |  | $ 2,500 |  |
Predecessor |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Gain on dispositions of assets | $ 3,561 |  |  | $ 24,099
Net properties and equipment |  |  |  | 2,864,762
Amortized gains on sale/leaseback transactions | 3,000 |  |  | 23,400
Predecessor | Other Operating Revenues | Subsea Business |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Revenues | $ 800 |  |  | $ 3,200

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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=109223946&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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