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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 87,494 |
Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 156,905
Americas Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 16,205 |
Percentage of Angolan operation revenue | 19.00% |
Americas Fleet Deepwater vessels | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 62,831
Percentage of Angolan operation revenue |  | 40.00%
Americas Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 6,846 |
Percentage of Angolan operation revenue | 8.00% |
Americas Fleet Towing-Supply/supply | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 14,738
Percentage of Angolan operation revenue |  | 9.00%
Americas Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 3,030 |
Percentage of Angolan operation revenue | 3.00% |
Americas Fleet Other | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 2,964
Percentage of Angolan operation revenue |  | 2.00%
Americas Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 26,081 |
Percentage of Angolan operation revenue | 30.00% |
Americas Fleet | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 80,533
Percentage of Angolan operation revenue |  | 51.00%
Middle East/Asia Pacific Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 9,564 |
Percentage of Angolan operation revenue | 11.00% |
Middle East/Asia Pacific Fleet Deepwater vessels | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 9,433
Percentage of Angolan operation revenue |  | 6.00%
Middle East/Asia Pacific Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 8,824 |
Percentage of Angolan operation revenue | 10.00% |
Middle East/Asia Pacific Fleet Towing-Supply/supply | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 17,245
Percentage of Angolan operation revenue |  | 11.00%
Middle East/Asia Pacific Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 18,388 |
Percentage of Angolan operation revenue | 21.00% |
Middle East/Asia Pacific Fleet | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 26,678
Percentage of Angolan operation revenue |  | 17.00%
Europe/Mediterranean Sea fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 9,020 |
Percentage of Angolan operation revenue | 10.00% |
Europe/Mediterranean Sea fleet Deepwater vessels | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 9,853
Percentage of Angolan operation revenue |  | 7.00%
Europe/Mediterranean Sea fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 603 |
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 |  | $ 322
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)
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 | $ 9,623 |
Percentage of Angolan operation revenue | 11.00% |
Europe/Mediterranean Sea fleet | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 10,166
Percentage of Angolan operation revenue |  | 7.00%
West Africa fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 13,938 |
Percentage of Angolan operation revenue | 16.00% |
West Africa fleet Deepwater vessels | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 13,179
Percentage of Angolan operation revenue |  | 8.00%
West Africa fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 16,139 |
Percentage of Angolan operation revenue | 18.00% |
West Africa fleet Towing-Supply/supply | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 22,472
Percentage of Angolan operation revenue |  | 15.00%
West Africa fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 3,325 |
Percentage of Angolan operation revenue | 4.00% |
West Africa fleet Other | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 3,877
Percentage of Angolan operation revenue |  | 2.00%
West Africa fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 33,402 |
Percentage of Angolan operation revenue | 38.00% |
West Africa fleet | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 39,528
Percentage of Angolan operation revenue |  | 25.00%
Worldwide Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 48,727 |
Percentage of Angolan operation revenue | 56.00% |
Worldwide Fleet Deepwater vessels | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 95,296
Percentage of Angolan operation revenue |  | 61.00%
Worldwide Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 32,412 |
Percentage of Angolan operation revenue | 37.00% |
Worldwide Fleet Towing-Supply/supply | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 54,777
Percentage of Angolan operation revenue |  | 35.00%
Worldwide Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 6,355 |
Percentage of Angolan operation revenue | 7.00% |
Worldwide Fleet Other | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 6,832
Percentage of Angolan operation revenue |  | 4.00%
Worldwide Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 87,494 |
Percentage of Angolan operation revenue | 100.00% |
Worldwide Fleet | Predecessor |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 156,905
Percentage of Angolan operation revenue |  | 100.00%

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