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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 171,884 |
Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 146,597 |  | $ 583,816
Americas Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 26,860 |
Percentage of revenue |  | 16.00% |
Americas Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 21,617 |  | $ 171,334
Percentage of revenue | 15.00% |  | 29.00%
Americas Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 13,835 |
Percentage of revenue |  | 8.00% |
Americas Fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 15,021 |  | $ 56,561
Percentage of revenue | 10.00% |  | 10.00%
Americas Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 5,089 |
Percentage of revenue |  | 3.00% |
Americas Fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 4,210 |  | $ 11,948
Percentage of revenue | 3.00% |  | 2.00%
Americas Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 45,784 |
Percentage of revenue |  | 27.00% |
Americas Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 40,848 |  | $ 239,843
Percentage of revenue | 28.00% |  | 41.00%
Middle East/Asia Pacific Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 14,792 |
Percentage of revenue |  | 9.00% |
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 13,368 |  | $ 35,526
Percentage of revenue | 9.00% |  | 6.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 25,053 |
Percentage of revenue |  | 14.00% |
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 22,945 |  | $ 79,092
Percentage of revenue | 16.00% |  | 13.00%
Middle East/Asia Pacific Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 39,845 |
Percentage of revenue |  | 23.00% |
Middle East/Asia Pacific Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 36,313 |  | $ 114,618
Percentage of revenue | 25.00% |  | 19.00%
Africa/Europe Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 42,335 |
Percentage of revenue |  | 24.00% |
Africa/Europe Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 29,746 |  | $ 102,374
Percentage of revenue | 20.00% |  | 18.00%
Africa/Europe Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 35,497 |
Percentage of revenue |  | 21.00% |
Africa/Europe Fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 35,143 |  | $ 102,732
Percentage of revenue | 24.00% |  | 18.00%
Africa And Europe Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 8,423 |
Percentage of revenue |  | 5.00% |
Africa And Europe Fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 4,547 |  | $ 24,249
Percentage of revenue | 3.00% |  | 4.00%
Africa/Europe Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 86,255 |
Percentage of revenue |  | 50.00% |
Africa/Europe Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 69,436 |  | $ 229,355
Percentage of revenue | 47.00% |  | 40.00%
Worldwide Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 83,987 |
Percentage of revenue |  | 49.00% |
Worldwide Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 64,731 |  | $ 309,234
Percentage of revenue | 44.00% |  | 53.00%
Worldwide Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 74,385 |
Percentage of revenue |  | 43.00% |
Worldwide Fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 73,109 |  | $ 238,385
Percentage of revenue | 50.00% |  | 41.00%
Worldwide Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 13,512 |
Percentage of revenue |  | 8.00% |
Worldwide Fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 8,757 |  | $ 36,197
Percentage of revenue | 6.00% |  | 6.00%
Worldwide Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 171,884 |
Percentage of revenue |  | 100.00% |
Worldwide Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 146,597 |  | $ 583,816
Percentage of revenue | 100.00% |  | 100.00%

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