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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 390,952 | $ 363,668 | $ 772,462 | $ 695,298
Americas Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 91,403 | 61,811 | 173,685 | 116,843
Percentage of revenue | 23.00% | 17.00% | 23.00% | 17.00%
Americas Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 34,387 | 30,861 | 63,904 | 58,531
Percentage of revenue | 9.00% | 8.00% | 8.00% | 8.00%
Americas Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 8,223 | 9,257 | 16,407 | 16,799
Percentage of revenue | 2.00% | 3.00% | 2.00% | 3.00%
Americas Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 134,013 | 101,929 | 253,996 | 192,173
Percentage of revenue | 34.00% | 28.00% | 33.00% | 28.00%
Asia and Pacific Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 27,675 | 19,923 | 51,917 | 44,215
Percentage of revenue | 7.00% | 5.00% | 7.00% | 6.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 17,338 | 16,559 | 32,375 | 34,281
Percentage of revenue | 5.00% | 5.00% | 4.00% | 5.00%
Asia and Pacific Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 976 | 948 | 1,946 | 1,890
Asia and Pacific Fleet Other | Maximum |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Percentage of revenue | 1.00% | 1.00% | 1.00% | 1.00%
Asia/Pacific Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 45,989 | 37,430 | 86,238 | 80,386
Percentage of revenue | 12.00% | 10.00% | 11.00% | 11.00%
Middle East/North Africa Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 19,254 | 15,732 | 38,721 | 31,584
Percentage of revenue | 5.00% | 5.00% | 5.00% | 5.00%
Middle East/North Africa Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 28,715 | 28,763 | 63,994 | 53,260
Percentage of revenue | 7.00% | 8.00% | 9.00% | 8.00%
Middle East and North Africa Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 868 | 875 | 1,661 | 1,739
Middle East and North Africa Fleet Other | Maximum |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Percentage of revenue | 1.00% | 1.00% | 1.00% | 1.00%
Middle East/North Africa |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 48,837 | 45,370 | 104,376 | 86,583
Percentage of revenue | 12.00% | 13.00% | 14.00% | 13.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 89,193 | 106,541 | 180,884 | 193,792
Percentage of revenue | 23.00% | 29.00% | 23.00% | 28.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 54,617 | 56,772 | 110,053 | 111,632
Percentage of revenue | 14.00% | 16.00% | 14.00% | 16.00%
Sub Saharan Africa And Europe Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 18,303 | 15,626 | 36,915 | 30,732
Percentage of revenue | 5.00% | 4.00% | 5.00% | 4.00%
Sub-Saharan Africa/Europe Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 162,113 | 178,939 | 327,852 | 336,156
Percentage of revenue | 42.00% | 49.00% | 42.00% | 48.00%
Worldwide Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 227,525 | 204,007 | 445,207 | 386,434
Percentage of revenue | 58.00% | 56.00% | 58.00% | 56.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 135,057 | 132,955 | 270,326 | 257,704
Percentage of revenue | 35.00% | 37.00% | 35.00% | 37.00%
Worldwide Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | 28,370 | 26,706 | 56,929 | 51,160
Percentage of revenue | 7.00% | 7.00% | 7.00% | 7.00%
Worldwide Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 390,952 | $ 363,668 | $ 772,462 | $ 695,298
Percentage of revenue | 100.00% | 100.00% | 100.00% | 100.00%

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