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Gain on Disposition of Assets, Net - Additional Information (Detail) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Vessel | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |  |  |  |
Number of ROVs disposed | Vessel |  |  |  | 8 |  |  |  | 8 |
Gain on dispositions of assets | $ 1,338 |  |  | $ 6,616 | $ 3,257 |  |  |  |
Net properties and equipment | $ 803,725 |  |  | 837,520 | $ 803,725 |  | $ 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 | $ 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 |  | $ 3,189 | $ 3,561 |  |  | $ 9,253 |  |  | $ 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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