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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 ($) | Dec. 31, 2017 USD ($) Vehicle | 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 | Vehicle |  | 8 |  |
Gain on dispositions of assets |  | $ 6,616 |  |
Net properties and equipment |  | 837,520 | $ 837,520 |
Other operating revenues |  | 6,869 |  |
Unamortized deferred gains credited to reorganization items on account of lease rejections |  |  | $ 105,900 |
Date of petition for bankruptcy |  |  | May 17, 2017 |
Subsea Business |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Other operating 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
Other operating revenues | 4,772 |  |  | 17,795
Amortized gains on sale/leaseback transactions | 3,000 |  |  | 23,400
Predecessor | Subsea Business |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Other operating revenues | 800 |  |  | $ 3,200
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 |  |  |

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- Definition Date petition for bankruptcy filed with the bankruptcy court, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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