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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 583,816 | $ 955,400 | $ 1,468,358
Americas Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 171,334 | $ 235,522 | $ 353,232
Percentage of revenue | 29.00% | 25.00% | 24.00%
Americas Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 56,561 | $ 92,768 | $ 125,029
Percentage of revenue | 10.00% | 9.00% | 9.00%
Americas Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 11,948 | $ 14,705 | $ 27,438
Percentage of revenue | 2.00% | 2.00% | 2.00%
Americas Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 239,843 | $ 342,995 | $ 505,699
Percentage of revenue | 41.00% | 36.00% | 35.00%
Asia and Pacific Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 7,252 | $ 60,853 | $ 94,538
Percentage of revenue | 1.00% | 6.00% | 6.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 18,316 | $ 28,192 | $ 53,281
Percentage of revenue | 3.00% | 3.00% | 4.00%
Asia and Pacific Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues |  |  | $ 3,001
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 | $ 25,568 | $ 89,045 | $ 150,820
Percentage of revenue | 4.00% | 9.00% | 10.00%
Middle East Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 28,274 | $ 23,596 | $ 28,637
Percentage of revenue | 5.00% | 2.00% | 2.00%
Middle East Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 60,776 | $ 87,760 | $ 105,642
Percentage of revenue | 10.00% | 10.00% | 7.00%
Middle East fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 89,050 | $ 111,356 | $ 134,279
Percentage of revenue | 15.00% | 12.00% | 9.00%
Africa/Europe Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 102,374 | $ 205,587 | $ 382,957
Percentage of revenue | 18.00% | 22.00% | 26.00%
Africa/Europe Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 102,732 | $ 153,818 | $ 219,914
Percentage of revenue | 18.00% | 16.00% | 15.00%
Africa And Europe Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 24,249 | $ 52,599 | $ 74,689
Percentage of revenue | 4.00% | 5.00% | 5.00%
Africa/Europe Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 229,355 | $ 412,004 | $ 677,560
Percentage of revenue | 40.00% | 43.00% | 46.00%
Worldwide Fleet Deepwater vessels |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 309,234 | $ 525,558 | $ 859,364
Percentage of revenue | 53.00% | 55.00% | 58.00%
Worldwide Fleet Towing-Supply/supply |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 238,385 | $ 362,538 | $ 503,866
Percentage of revenue | 41.00% | 38.00% | 35.00%
Worldwide Fleet Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 36,197 | $ 67,304 | $ 105,128
Percentage of revenue | 6.00% | 7.00% | 7.00%
Worldwide Fleet |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Vessel revenues | $ 583,816 | $ 955,400 | $ 1,468,358
Percentage of revenue | 100.00% | 100.00% | 100.00%

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