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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Jul. 31, 2017 | Sep. 30, 2016
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 70,571 |  |  |
Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 34,340 |  | $ 139,361 | $ 146,597 | $ 301,791
Americas Fleet Deepwater vessels |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 9,798 |  |  |
Percentage of revenue |  | 14.00% |  |  |
Americas Fleet Deepwater vessels | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 4,304 |  | $ 37,270 | $ 21,617 | $ 77,657
Percentage of revenue | 12.00% |  | 27.00% | 15.00% | 26.00%
Americas Fleet Towing-Supply/supply |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 5,572 |  |  |
Percentage of revenue |  | 8.00% |  |  |
Americas Fleet Towing-Supply/supply | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 3,747 |  | $ 13,039 | $ 15,021 | $ 29,918
Percentage of revenue | 11.00% |  | 9.00% | 10.00% | 10.00%
Americas Fleet Other |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 2,079 |  |  |
Percentage of revenue |  | 3.00% |  |  |
Americas Fleet Other | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 910 |  | $ 2,816 | $ 4,210 | $ 6,158
Percentage of revenue | 3.00% |  | 2.00% | 3.00% | 2.00%
Americas Fleet |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 17,449 |  |  |
Percentage of revenue |  | 25.00% |  |  |
Americas Fleet | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 8,961 |  | $ 53,125 | $ 40,848 | $ 113,733
Percentage of revenue | 26.00% |  | 38.00% | 28.00% | 38.00%
Middle East/Asia Pacific Fleet Deepwater vessels |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 5,726 |  |  |
Percentage of revenue |  | 8.00% |  |  |
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 2,667 |  | $ 8,860 | $ 13,368 | $ 17,488
Percentage of revenue | 8.00% |  | 6.00% | 9.00% | 6.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 10,943 |  |  |
Percentage of revenue |  | 16.00% |  |  |
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 5,880 |  | $ 20,724 | $ 22,945 | $ 44,219
Percentage of revenue | 17.00% |  | 15.00% | 16.00% | 14.00%
Middle East/Asia Pacific Fleet |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 16,669 |  |  |
Percentage of revenue |  | 24.00% |  |  |
Middle East/Asia Pacific Fleet | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 8,547 |  | $ 29,584 | $ 36,313 | $ 61,707
Percentage of revenue | 25.00% |  | 21.00% | 25.00% | 20.00%
Africa/Europe Fleet Deepwater vessels |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 17,582 |  |  |
Percentage of revenue |  | 25.00% |  |  |
Africa/Europe Fleet Deepwater vessels | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 7,588 |  | $ 24,305 | $ 29,746 | $ 57,594
Percentage of revenue | 22.00% |  | 17.00% | 20.00% | 19.00%
Africa/Europe Fleet Towing-Supply/supply |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 15,049 |  |  |
Percentage of revenue |  | 21.00% |  |  |
Africa/Europe Fleet Towing-Supply/supply | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 8,124 |  | $ 25,934 | $ 35,143 | $ 53,851
Percentage of revenue | 24.00% |  | 19.00% | 24.00% | 18.00%
Africa And Europe Fleet Other |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 3,822 |  |  |
Percentage of revenue |  | 5.00% |  |  |
Africa And Europe Fleet Other | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 1,120 |  | $ 6,413 | $ 4,547 | $ 14,906
Percentage of revenue | 3.00% |  | 5.00% | 3.00% | 5.00%
Africa/Europe Fleet |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 36,453 |  |  |
Percentage of revenue |  | 51.00% |  |  |
Africa/Europe Fleet | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 16,832 |  | $ 56,652 | $ 69,436 | $ 126,351
Percentage of revenue | 49.00% |  | 41.00% | 47.00% | 42.00%
Worldwide Fleet Deepwater vessels |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 33,106 |  |  |
Percentage of revenue |  | 47.00% |  |  |
Worldwide Fleet Deepwater vessels | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 14,559 |  | $ 70,435 | $ 64,731 | $ 152,739
Percentage of revenue | 42.00% |  | 50.00% | 44.00% | 51.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 31,564 |  |  |
Percentage of revenue |  | 45.00% |  |  |
Worldwide Fleet Towing-Supply/supply | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 17,751 |  | $ 59,697 | $ 73,109 | $ 127,988
Percentage of revenue | 52.00% |  | 43.00% | 50.00% | 42.00%
Worldwide Fleet Other |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 5,901 |  |  |
Percentage of revenue |  | 8.00% |  |  |
Worldwide Fleet Other | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 2,030 |  | $ 9,229 | $ 8,757 | $ 21,064
Percentage of revenue | 6.00% |  | 7.00% | 6.00% | 7.00%
Worldwide Fleet |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues |  | $ 70,571 |  |  |
Percentage of revenue |  | 100.00% |  |  |
Worldwide Fleet | Predecessor |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |
Vessel revenues | $ 34,340 |  | $ 139,361 | $ 146,597 | $ 301,791
Percentage of revenue | 100.00% |  | 100.00% | 100.00% | 100.00%

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