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Summary of Vessels and ROVs Impaired, Amount of Impairment Incurred and Combined Fair Value of Assets after Impairment Charges (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
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Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jul. 31, 2017 | [1] | Dec. 31, 2017 | Mar. 31, 2017
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  | $ 16,777 |  |  |  |  |  |  | $ 16,777 | [1] |  |
Inventory and Other Non-vessel Assets |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  | $ 2,300 |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments | $ 21,325 |  | $ 163,423 | $ 64,857 | $ 253,422 | $ 129,562 | $ 36,886 | $ 184,748 |  |  | $ 484,727 | [1]
Predecessor | Inventory and Other Non-vessel Assets |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  | $ 2,200 |
[1] | The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.

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