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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 212,908 | $ 378,126 | $ 775,352 | $ 1,150,588
Americas Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 49,792 | $ 94,298 | $ 191,720 | $ 267,983
Percentage of revenue | 23.00% | 25.00% | 25.00% | 23.00%
Americas Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 22,254 | $ 33,607 | $ 75,890 | $ 97,511
Percentage of revenue | 11.00% | 9.00% | 10.00% | 9.00%
Americas Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 3,917 | $ 6,649 | $ 11,735 | $ 23,056
Percentage of revenue | 2.00% | 2.00% | 1.00% | 2.00%
Americas Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 75,963 | $ 134,554 | $ 279,345 | $ 388,550
Percentage of revenue | 36.00% | 36.00% | 36.00% | 34.00%
Asia and Pacific Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 13,267 | $ 20,575 | $ 56,535 | $ 72,492
Percentage of revenue | 6.00% | 5.00% | 7.00% | 6.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 5,877 | $ 13,487 | $ 22,719 | $ 45,862
Percentage of revenue | 3.00% | 4.00% | 3.00% | 4.00%
Asia and Pacific Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues |  | $ 984 |  | $ 2,930
Asia and Pacific Fleet Other | Maximum |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Percentage of revenue |  | 1.00% |  | 1.00%
Asia/Pacific Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 19,144 | $ 35,046 | $ 79,254 | $ 121,284
Percentage of revenue | 9.00% | 9.00% | 10.00% | 10.00%
Middle East/North Africa Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 17,690 | $ 25,615 | $ 58,845 | $ 64,336
Percentage of revenue | 9.00% | 7.00% | 8.00% | 6.00%
Middle East/North Africa Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 21,795 | $ 29,441 | $ 71,898 | $ 93,435
Percentage of revenue | 10.00% | 8.00% | 9.00% | 8.00%
Middle East and North Africa Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 699 | $ 869 | $ 2,043 | $ 2,530
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 fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 40,184 | $ 55,925 | $ 132,786 | $ 160,301
Percentage of revenue | 19.00% | 15.00% | 17.00% | 14.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 30,361 | $ 81,129 | $ 124,282 | $ 262,013
Percentage of revenue | 14.00% | 21.00% | 16.00% | 23.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 35,186 | $ 52,532 | $ 118,490 | $ 162,585
Percentage of revenue | 16.00% | 14.00% | 15.00% | 14.00%
Sub Saharan Africa And Europe Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 12,070 | $ 18,940 | $ 41,195 | $ 55,855
Percentage of revenue | 6.00% | 5.00% | 6.00% | 5.00%
Sub-Saharan Africa/Europe Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 77,617 | $ 152,601 | $ 283,967 | $ 480,453
Percentage of revenue | 36.00% | 40.00% | 37.00% | 42.00%
Worldwide Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 111,110 | $ 221,617 | $ 431,382 | $ 666,824
Percentage of revenue | 52.00% | 58.00% | 56.00% | 58.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 85,112 | $ 129,067 | $ 288,997 | $ 399,393
Percentage of revenue | 40.00% | 35.00% | 37.00% | 35.00%
Worldwide Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 16,686 | $ 27,442 | $ 54,973 | $ 84,371
Percentage of revenue | 8.00% | 7.00% | 7.00% | 7.00%
Worldwide Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 212,908 | $ 378,126 | $ 775,352 | $ 1,150,588
Percentage of revenue | 100.00% | 100.00% | 100.00% | 100.00%

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