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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - Entity [Domain] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 298,313 | $ 381,510
Americas Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 80,152 | $ 82,282
Percentage of revenue | 27.00% | 21.00%
Americas Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 29,515 | $ 29,517
Percentage of revenue | 10.00% | 8.00%
Americas Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 4,505 | $ 8,184
Percentage of revenue | 1.00% | 2.00%
Americas Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 114,172 | $ 119,983
Percentage of revenue | 38.00% | 31.00%
Asia and Pacific Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 19,833 | $ 24,242
Percentage of revenue | 7.00% | 7.00%
Asia/Pacific Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 8,104 | $ 15,037
Percentage of revenue | 2.00% | 4.00%
Asia and Pacific Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues |  | $ 970
Asia and Pacific Fleet Other | Maximum |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Percentage of revenue |  | 1.00%
Asia/Pacific Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 27,937 | $ 40,249
Percentage of revenue | 9.00% | 11.00%
Middle East/North Africa Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 20,386 | $ 19,467
Percentage of revenue | 7.00% | 5.00%
Middle East/North Africa Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 26,189 | $ 35,279
Percentage of revenue | 9.00% | 9.00%
Middle East and North Africa Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 691 | $ 793
Percentage of revenue | 1.00% |
Middle East and North Africa Fleet Other | Maximum |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Percentage of revenue |  | 1.00%
Middle East/North Africa fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 47,266 | $ 55,539
Percentage of revenue | 16.00% | 15.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 53,966 | $ 91,691
Percentage of revenue | 18.00% | 24.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 41,198 | $ 55,436
Percentage of revenue | 14.00% | 14.00%
Sub Saharan Africa And Europe Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 13,774 | $ 18,612
Percentage of revenue | 5.00% | 5.00%
Sub-Saharan Africa/Europe Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 108,938 | $ 165,739
Percentage of revenue | 37.00% | 43.00%
Worldwide Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 174,337 | $ 217,682
Percentage of revenue | 59.00% | 57.00%
Worldwide Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 105,006 | $ 135,269
Percentage of revenue | 35.00% | 35.00%
Worldwide Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 18,970 | $ 28,559
Percentage of revenue | 6.00% | 8.00%
Worldwide Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 298,313 | $ 381,510
Percentage of revenue | 100.00% | 100.00%

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