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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 139,361 | $ 264,131 | $ 301,791 | $ 562,444
Americas Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 37,270 | $ 61,776 | $ 77,657 | $ 141,928
Percentage of revenue | 27.00% | 24.00% | 26.00% | 25.00%
Americas Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 13,039 | $ 24,121 | $ 29,918 | $ 53,636
Percentage of revenue | 9.00% | 9.00% | 10.00% | 9.00%
Americas Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 2,816 | $ 3,313 | $ 6,158 | $ 7,818
Percentage of revenue | 2.00% | 1.00% | 2.00% | 2.00%
Americas Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 53,125 | $ 89,210 | $ 113,733 | $ 203,382
Percentage of revenue | 38.00% | 34.00% | 38.00% | 36.00%
Asia and Pacific Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 1,872 | $ 23,435 | $ 4,462 | $ 43,268
Percentage of revenue | 1.00% | 9.00% | 2.00% | 8.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 4,238 | $ 8,738 | $ 9,569 | $ 16,842
Percentage of revenue | 3.00% | 3.00% | 3.00% | 3.00%
Asia/Pacific Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 6,110 | $ 32,173 | $ 14,031 | $ 60,110
Percentage of revenue | 4.00% | 12.00% | 5.00% | 11.00%
Middle East Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 6,988 | $ 5,750 | $ 13,026 | $ 12,441
Percentage of revenue | 5.00% | 2.00% | 4.00% | 2.00%
Middle East Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 16,486 | $ 22,934 | $ 34,650 | $ 48,496
Percentage of revenue | 12.00% | 9.00% | 11.00% | 9.00%
Middle East fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 23,474 | $ 28,684 | $ 47,676 | $ 60,937
Percentage of revenue | 17.00% | 11.00% | 15.00% | 11.00%
Africa/Europe Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 24,305 | $ 54,974 | $ 57,594 | $ 122,635
Percentage of revenue | 17.00% | 21.00% | 19.00% | 22.00%
Africa/Europe Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 25,934 | $ 43,086 | $ 53,851 | $ 84,911
Percentage of revenue | 19.00% | 16.00% | 18.00% | 15.00%
Africa And Europe Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 6,413 | $ 16,004 | $ 14,906 | $ 30,469
Percentage of revenue | 5.00% | 6.00% | 5.00% | 5.00%
Africa/Europe Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 56,652 | $ 114,064 | $ 126,351 | $ 238,015
Percentage of revenue | 41.00% | 43.00% | 42.00% | 42.00%
Worldwide Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 70,435 | $ 145,935 | $ 152,739 | $ 320,272
Percentage of revenue | 50.00% | 56.00% | 51.00% | 57.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 59,697 | $ 98,879 | $ 127,988 | $ 203,885
Percentage of revenue | 43.00% | 37.00% | 42.00% | 36.00%
Worldwide Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 9,229 | $ 19,317 | $ 21,064 | $ 38,287
Percentage of revenue | 7.00% | 7.00% | 7.00% | 7.00%
Worldwide Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 139,361 | $ 264,131 | $ 301,791 | $ 562,444
Percentage of revenue | 100.00% | 100.00% | 100.00% | 100.00%

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