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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 162,430 | $ 298,313
Americas Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 40,387 | $ 80,152
Percentage of revenue | 25.00% | 27.00%
Americas Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 16,879 | $ 29,515
Percentage of revenue | 10.00% | 10.00%
Americas Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 3,342 | $ 4,505
Percentage of revenue | 2.00% | 1.00%
Americas Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 60,608 | $ 114,172
Percentage of revenue | 37.00% | 38.00%
Asia and Pacific Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 2,590 | $ 19,833
Percentage of revenue | 2.00% | 7.00%
Asia/Pacific Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 5,331 | $ 8,104
Percentage of revenue | 3.00% | 2.00%
Asia/Pacific Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 7,921 | $ 27,937
Percentage of revenue | 5.00% | 9.00%
Middle East Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 6,038 | $ 6,691
Percentage of revenue | 4.00% | 2.00%
Middle East Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 18,164 | $ 25,562
Percentage of revenue | 11.00% | 9.00%
Middle East fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 24,202 | $ 32,253
Percentage of revenue | 15.00% | 11.00%
Africa/Europe Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 33,289 | $ 67,661
Percentage of revenue | 20.00% | 23.00%
Africa/Europe Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 27,917 | $ 41,825
Percentage of revenue | 18.00% | 14.00%
Africa And Europe Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 8,493 | $ 14,465
Percentage of revenue | 5.00% | 5.00%
Africa/Europe Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 69,699 | $ 123,951
Percentage of revenue | 43.00% | 42.00%
Worldwide Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 82,304 | $ 174,337
Percentage of revenue | 51.00% | 59.00%
Worldwide Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 68,291 | $ 105,006
Percentage of revenue | 42.00% | 35.00%
Worldwide Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 11,835 | $ 18,970
Percentage of revenue | 7.00% | 6.00%
Worldwide Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 162,430 | $ 298,313
Percentage of revenue | 100.00% | 100.00%

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