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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 105,601 |  | $ 197,094 |
Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 115,106 |  | $ 275,855
Americas Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 22,661 |  | $ 38,866 |
Percentage of Angolan operation revenue | 22.00% |  | 20.00% |
Americas Fleet Deepwater vessels | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 17,313 |  | $ 80,144
Percentage of Angolan operation revenue |  | 15.00% |  | 30.00%
Americas Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 7,560 |  | $ 14,406 |
Percentage of Angolan operation revenue | 7.00% |  | 8.00% |
Americas Fleet Towing-Supply/supply | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 11,274 |  | $ 26,012
Percentage of Angolan operation revenue |  | 10.00% |  | 10.00%
Americas Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 2,380 |  | $ 5,410 |
Percentage of Angolan operation revenue | 2.00% |  | 3.00% |
Americas Fleet Other | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 3,300 |  | $ 6,264
Percentage of Angolan operation revenue |  | 3.00% |  | 2.00%
Americas Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 32,601 |  | $ 58,682 |
Percentage of Angolan operation revenue | 31.00% |  | 31.00% |
Americas Fleet | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 31,887 |  | $ 112,420
Percentage of Angolan operation revenue |  | 28.00% |  | 42.00%
Middle East/Asia Pacific Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 9,603 |  | $ 19,167 |
Percentage of Angolan operation revenue | 9.00% |  | 10.00% |
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 10,701 |  | $ 20,134
Percentage of Angolan operation revenue |  | 10.00% |  | 7.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 12,783 |  | $ 21,607 |
Percentage of Angolan operation revenue | 12.00% |  | 11.00% |
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 17,065 |  | $ 34,310
Percentage of Angolan operation revenue |  | 15.00% |  | 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 |  | $ 40,794 |
Percentage of Angolan operation revenue | 21.00% |  | 21.00% |
Middle East/Asia Pacific Fleet | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 27,766 |  | $ 54,444
Percentage of Angolan operation revenue |  | 25.00% |  | 20.00%
Europe/Mediterranean Sea fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 12,596 |  | $ 21,616 |
Percentage of Angolan operation revenue | 12.00% |  | 11.00% |
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 8,237 |  | $ 18,090
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 | $ 761 |  | $ 1,364 |
Percentage of Angolan operation revenue | 1.00% |  | 1.00% |
Europe/Mediterranean Sea fleet Towing-Supply/supply | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 2,794 |  | $ 3,116
Percentage of Angolan operation revenue |  | 2.00% |  | 1.00%
Europe/Mediterranean Sea fleet Other | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  |  |  | $ (9)
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 | $ 13,357 |  | $ 22,980 |
Percentage of Angolan operation revenue | 13.00% |  | 12.00% |
Europe/Mediterranean Sea fleet | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 11,031 |  | $ 21,197
Percentage of Angolan operation revenue |  | 10.00% |  | 8.00%
West Africa fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 14,314 |  | $ 28,252 |
Percentage of Angolan operation revenue | 14.00% |  | 15.00% |
West Africa fleet Deepwater vessels | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 13,921 |  | $ 27,100
Percentage of Angolan operation revenue |  | 12.00% |  | 10.00%
West Africa fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 17,321 |  | $ 33,460 |
Percentage of Angolan operation revenue | 17.00% |  | 17.00% |
West Africa fleet Towing-Supply/supply | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 24,225 |  | $ 46,697
Percentage of Angolan operation revenue |  | 22.00% |  | 17.00%
West Africa fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 4,175 |  | $ 7,500 |
Percentage of Angolan operation revenue | 4.00% |  | 4.00% |
West Africa fleet Other | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 3,427 |  | $ 7,304
Percentage of Angolan operation revenue |  | 3.00% |  | 3.00%
West Africa fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 35,810 |  | $ 69,212 |
Percentage of Angolan operation revenue | 35.00% |  | 36.00% |
West Africa fleet | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 41,573 |  | $ 81,101
Percentage of Angolan operation revenue |  | 37.00% |  | 30.00%
Worldwide Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 59,174 |  | $ 107,901 |
Percentage of Angolan operation revenue | 57.00% |  | 56.00% |
Worldwide Fleet Deepwater vessels | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 50,172 |  | $ 145,468
Percentage of Angolan operation revenue |  | 45.00% |  | 54.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 38,425 |  | $ 70,837 |
Percentage of Angolan operation revenue | 37.00% |  | 37.00% |
Worldwide Fleet Towing-Supply/supply | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 55,358 |  | $ 110,135
Percentage of Angolan operation revenue |  | 49.00% |  | 41.00%
Worldwide Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 6,575 |  | $ 12,930 |
Percentage of Angolan operation revenue | 6.00% |  | 7.00% |
Worldwide Fleet Other | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 6,727 |  | $ 13,559
Percentage of Angolan operation revenue |  | 6.00% |  | 5.00%
Worldwide Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 104,174 |  | $ 191,668 |
Percentage of Angolan operation revenue | 100.00% |  | 100.00% |
Worldwide Fleet | Predecessor |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 112,257 |  | $ 269,162
Percentage of Angolan operation revenue |  | 100.00% |  | 100.00%

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