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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 |  | $ 178,753 |
Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 151,369 |  | $ 601,611
Americas Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 26,860 |
Percentage of Angolan operation revenue |  | 16.00% |
Americas Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 21,617 |  | $ 171,334
Percentage of Angolan operation revenue | 15.00% |  | 29.00%
Americas Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 13,835 |
Percentage of Angolan operation 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 Angolan operation revenue | 10.00% |  | 10.00%
Americas Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 5,089 |
Percentage of Angolan operation revenue |  | 3.00% |
Americas Fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 4,210 |  | $ 11,948
Percentage of Angolan operation revenue | 3.00% |  | 2.00%
Americas Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 45,784 |
Percentage of Angolan operation revenue |  | 27.00% |
Americas Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 40,848 |  | $ 239,843
Percentage of Angolan operation 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 Angolan operation 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 Angolan operation 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 Angolan operation 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 Angolan operation revenue | 16.00% |  | 13.00%
Middle East/Asia Pacific Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 39,845 |
Percentage of Angolan operation 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 Angolan operation revenue | 25.00% |  | 19.00%
Europe/Mediterranean Sea fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 18,204 |
Percentage of Angolan operation revenue |  | 10.00% |
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 11,620 |  | $ 39,492
Percentage of Angolan operation revenue | 8.00% |  | 7.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 1,691 |
Percentage of Angolan operation revenue |  | 1.00% |
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 3,846 |  | $ 2,659
Percentage of Angolan operation revenue | 3.00% |  |
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor | Maximum |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Percentage of Angolan operation revenue |  |  | 1.00%
Europe/Mediterranean Sea fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  |  | $ 516
Europe/Mediterranean Sea fleet Other | Predecessor | Maximum |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Percentage of Angolan operation revenue |  |  | 1.00%
Europe/Mediterranean Sea fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 19,895 |
Percentage of Angolan operation revenue |  | 11.00% |
Europe/Mediterranean Sea fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 15,466 |  | $ 42,667
Percentage of Angolan operation revenue | 11.00% |  | 8.00%
West Africa fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 24,131 |
Percentage of Angolan operation revenue |  | 13.00% |
West Africa fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 18,126 |  | $ 62,882
Percentage of Angolan operation revenue | 12.00% |  | 11.00%
West Africa fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 33,806 |
Percentage of Angolan operation revenue |  | 20.00% |
West Africa fleet Towing-Supply/supply | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 31,297 |  | $ 100,073
Percentage of Angolan operation revenue | 21.00% |  | 17.00%
West Africa fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 8,423 |
Percentage of Angolan operation revenue |  | 5.00% |
West Africa fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 4,547 |  | $ 23,733
Percentage of Angolan operation revenue | 3.00% |  | 4.00%
West Africa fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 66,360 |
Percentage of Angolan operation revenue |  | 39.00% |
West Africa fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 53,970 |  | $ 186,688
Percentage of Angolan operation revenue | 36.00% |  | 32.00%
Worldwide Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 83,987 |
Percentage of Angolan operation revenue |  | 49.00% |
Worldwide Fleet Deepwater vessels | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 64,731 |  | $ 309,234
Percentage of Angolan operation revenue | 44.00% |  | 53.00%
Worldwide Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 74,385 |
Percentage of Angolan operation 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 Angolan operation revenue | 50.00% |  | 41.00%
Worldwide Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 13,512 |
Percentage of Angolan operation revenue |  | 8.00% |
Worldwide Fleet Other | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 8,757 |  | $ 36,197
Percentage of Angolan operation revenue | 6.00% |  | 6.00%
Worldwide Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 171,884 |
Percentage of Angolan operation revenue |  | 100.00% |
Worldwide Fleet | Predecessor |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 146,597 |  | $ 583,816
Percentage of Angolan operation revenue | 100.00% |  | 100.00%

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