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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 105,601 |  |  | $ 178,753 | $ 197,094 |  |
Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 115,106 | $ 151,369 |  |  | $ 275,855 | $ 601,611
Americas Fleet Deepwater vessels |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 22,661 |  |  | $ 26,860 | $ 38,866 |  |
Percentage of Angolan operation revenue | 22.00% |  |  | 16.00% | 20.00% |  |
Americas Fleet Deepwater vessels | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 17,313 | $ 21,617 |  |  | $ 80,144 | $ 171,334
Percentage of Angolan operation revenue |  | 15.00% | 15.00% |  |  | 30.00% | 29.00%
Americas Fleet Towing-Supply/supply |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 7,560 |  |  | $ 13,835 | $ 14,406 |  |
Percentage of Angolan operation revenue | 7.00% |  |  | 8.00% | 8.00% |  |
Americas Fleet Towing-Supply/supply | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 11,274 | $ 15,021 |  |  | $ 26,012 | $ 56,561
Percentage of Angolan operation revenue |  | 10.00% | 10.00% |  |  | 10.00% | 10.00%
Americas Fleet Other |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 2,380 |  |  | $ 5,089 | $ 5,410 |  |
Percentage of Angolan operation revenue | 2.00% |  |  | 3.00% | 3.00% |  |
Americas Fleet Other | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 3,300 | $ 4,210 |  |  | $ 6,264 | $ 11,948
Percentage of Angolan operation revenue |  | 3.00% | 3.00% |  |  | 2.00% | 2.00%
Americas Fleet |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 32,601 |  |  | $ 45,784 | $ 58,682 |  |
Percentage of Angolan operation revenue | 31.00% |  |  | 27.00% | 31.00% |  |
Americas Fleet | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 31,887 | $ 40,848 |  |  | $ 112,420 | $ 239,843
Percentage of Angolan operation revenue |  | 28.00% | 28.00% |  |  | 42.00% | 41.00%
Middle East/Asia Pacific Fleet Deepwater vessels |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 9,603 |  |  | $ 14,792 | $ 19,167 |  |
Percentage of Angolan operation revenue | 9.00% |  |  | 9.00% | 10.00% |  |
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 10,701 | $ 13,368 |  |  | $ 20,134 | $ 35,526
Percentage of Angolan operation revenue |  | 10.00% | 9.00% |  |  | 7.00% | 6.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 12,783 |  |  | $ 25,053 | $ 21,607 |  |
Percentage of Angolan operation revenue | 12.00% |  |  | 14.00% | 11.00% |  |
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 17,065 | $ 22,945 |  |  | $ 34,310 | $ 79,092
Percentage of Angolan operation revenue |  | 15.00% | 16.00% |  |  | 13.00% | 13.00%
Middle East/Asia Pacific Fleet Other |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 20 |  |  |  | $ 20 |  |
Middle East/Asia Pacific Fleet Other | Maximum |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Percentage of Angolan operation revenue | 1.00% |  |  |  | 1.00% |  |
Middle East/Asia Pacific Fleet |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 22,406 |  |  | $ 39,845 | $ 40,794 |  |
Percentage of Angolan operation revenue | 21.00% |  |  | 23.00% | 21.00% |  |
Middle East/Asia Pacific Fleet | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 27,766 | $ 36,313 |  |  | $ 54,444 | $ 114,618
Percentage of Angolan operation revenue |  | 25.00% | 25.00% |  |  | 20.00% | 19.00%
Europe/Mediterranean Sea fleet Deepwater vessels |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 12,596 |  |  | $ 18,204 | $ 21,616 |  |
Percentage of Angolan operation revenue | 12.00% |  |  | 10.00% | 11.00% |  |
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 8,237 | $ 11,620 |  |  | $ 18,090 | $ 39,492
Percentage of Angolan operation revenue |  | 8.00% | 8.00% |  |  | 7.00% | 7.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 761 |  |  | $ 1,691 | $ 1,364 |  |
Percentage of Angolan operation revenue | 1.00% |  |  | 1.00% | 1.00% |  |
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 2,794 | $ 3,846 |  |  | $ 3,116 | $ 2,659
Percentage of Angolan operation revenue |  | 2.00% | 3.00% |  |  | 1.00% |
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 |  |  |  |  |  | $ (9) | $ 516
Europe/Mediterranean Sea fleet Other | Predecessor | Maximum |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Percentage of Angolan operation revenue |  |  |  |  |  | (1.00%) | 1.00%
Europe/Mediterranean Sea fleet |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 13,357 |  |  | $ 19,895 | $ 22,980 |  |
Percentage of Angolan operation revenue | 13.00% |  |  | 11.00% | 12.00% |  |
Europe/Mediterranean Sea fleet | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 11,031 | $ 15,466 |  |  | $ 21,197 | $ 42,667
Percentage of Angolan operation revenue |  | 10.00% | 11.00% |  |  | 8.00% | 8.00%
West Africa fleet Deepwater vessels |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 14,314 |  |  | $ 24,131 | $ 28,252 |  |
Percentage of Angolan operation revenue | 14.00% |  |  | 13.00% | 15.00% |  |
West Africa fleet Deepwater vessels | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 13,921 | $ 18,126 |  |  | $ 27,100 | $ 62,882
Percentage of Angolan operation revenue |  | 12.00% | 12.00% |  |  | 10.00% | 11.00%
West Africa fleet Towing-Supply/supply |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 17,321 |  |  | $ 33,806 | $ 33,460 |  |
Percentage of Angolan operation revenue | 17.00% |  |  | 20.00% | 17.00% |  |
West Africa fleet Towing-Supply/supply | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 24,225 | $ 31,297 |  |  | $ 46,697 | $ 100,073
Percentage of Angolan operation revenue |  | 22.00% | 21.00% |  |  | 17.00% | 17.00%
West Africa fleet Other |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 4,175 |  |  | $ 8,423 | $ 7,500 |  |
Percentage of Angolan operation revenue | 4.00% |  |  | 5.00% | 4.00% |  |
West Africa fleet Other | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 3,427 | $ 4,547 |  |  | $ 7,304 | $ 23,733
Percentage of Angolan operation revenue |  | 3.00% | 3.00% |  |  | 3.00% | 4.00%
West Africa fleet |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 35,810 |  |  | $ 66,360 | $ 69,212 |  |
Percentage of Angolan operation revenue | 35.00% |  |  | 39.00% | 36.00% |  |
West Africa fleet | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 41,573 | $ 53,970 |  |  | $ 81,101 | $ 186,688
Percentage of Angolan operation revenue |  | 37.00% | 36.00% |  |  | 30.00% | 32.00%
Worldwide Fleet Deepwater vessels |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 59,174 |  |  | $ 83,987 | $ 107,901 |  |
Percentage of Angolan operation revenue | 57.00% |  |  | 49.00% | 56.00% |  |
Worldwide Fleet Deepwater vessels | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 50,172 | $ 64,731 |  |  | $ 145,468 | $ 309,234
Percentage of Angolan operation revenue |  | 45.00% | 44.00% |  |  | 54.00% | 53.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 38,425 |  |  | $ 74,385 | $ 70,837 |  |
Percentage of Angolan operation revenue | 37.00% |  |  | 43.00% | 37.00% |  |
Worldwide Fleet Towing-Supply/supply | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 55,358 | $ 73,109 |  |  | $ 110,135 | $ 238,385
Percentage of Angolan operation revenue |  | 49.00% | 50.00% |  |  | 41.00% | 41.00%
Worldwide Fleet Other |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 6,575 |  |  | $ 13,512 | $ 12,930 |  |
Percentage of Angolan operation revenue | 6.00% |  |  | 8.00% | 7.00% |  |
Worldwide Fleet Other | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 6,727 | $ 8,757 |  |  | $ 13,559 | $ 36,197
Percentage of Angolan operation revenue |  | 6.00% | 6.00% |  |  | 5.00% | 6.00%
Worldwide Fleet |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues | $ 104,174 |  |  | $ 171,884 | $ 191,668 |  |
Percentage of Angolan operation revenue | 100.00% |  |  | 100.00% | 100.00% |  |
Worldwide Fleet | Predecessor |  |  |  |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |  |  |  |
Vessel revenues |  | $ 112,257 | $ 146,597 |  |  | $ 269,162 | $ 583,816
Percentage of Angolan operation revenue |  | 100.00% | 100.00% |  |  | 100.00% | 100.00%

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