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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 955,400 | $ 1,468,358 | $ 1,418,461
Americas Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 235,522 | $ 353,232 | $ 263,750
Percentage of revenue | 25.00% | 24.00% | 18.00%
Americas Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 92,768 | $ 125,029 | $ 115,055
Percentage of revenue | 9.00% | 9.00% | 8.00%
Americas Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 14,705 | $ 27,438 | $ 31,926
Percentage of revenue | 2.00% | 2.00% | 3.00%
Americas Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 342,995 | $ 505,699 | $ 410,731
Percentage of revenue | 36.00% | 35.00% | 29.00%
Asia and Pacific Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 60,853 | $ 94,538 | $ 88,191
Percentage of revenue | 6.00% | 6.00% | 6.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 28,192 | $ 53,281 | $ 62,630
Percentage of revenue | 3.00% | 4.00% | 5.00%
Asia and Pacific Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  | $ 3,001 | $ 3,797
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 | $ 89,045 | $ 150,820 | $ 154,618
Percentage of revenue | 9.00% | 10.00% | 11.00%
Middle East/North Africa Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 74,563 | $ 85,279 | $ 66,503
Percentage of revenue | 8.00% | 6.00% | 5.00%
Middle East/North Africa Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 91,174 | $ 117,232 | $ 116,720
Percentage of revenue | 10.00% | 8.00% | 8.00%
Middle East and North Africa Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 2,734 | $ 3,276 | $ 3,301
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%
Middle East/North Africa fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 168,471 | $ 205,787 | $ 186,524
Percentage of revenue | 18.00% | 14.00% | 13.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 154,620 | $ 326,315 | $ 364,722
Percentage of revenue | 16.00% | 22.00% | 26.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 150,404 | $ 208,324 | $ 231,224
Percentage of revenue | 16.00% | 14.00% | 16.00%
Sub Saharan Africa And Europe Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 49,865 | $ 71,413 | $ 70,642
Percentage of revenue | 5.00% | 5.00% | 5.00%
Sub-Saharan Africa/Europe Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 354,889 | $ 606,052 | $ 666,588
Percentage of revenue | 37.00% | 41.00% | 47.00%
Worldwide Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 525,558 | $ 859,364 | $ 783,166
Percentage of revenue | 55.00% | 58.00% | 55.00%
Worldwide Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 362,538 | $ 503,866 | $ 525,629
Percentage of revenue | 38.00% | 35.00% | 37.00%
Worldwide Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 67,304 | $ 105,128 | $ 109,666
Percentage of revenue | 7.00% | 7.00% | 8.00%
Worldwide Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 955,400 | $ 1,468,358 | $ 1,418,461
Percentage of revenue | 100.00% | 100.00% | 100.00%

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