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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 ($) | Dec. 31, 2018 USD ($) | 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 |  | $ 10,624 |
Net properties and equipment |  | 850,935 | $ 850,935 | $ 1,089,857 |
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
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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