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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, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 125,120 | $ 212,908 | $ 426,911 | $ 775,352
Americas Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 30,846 | $ 49,792 | $ 108,503 | $ 191,720
Percentage of revenue | 25.00% | 23.00% | 25.00% | 25.00%
Americas Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 11,905 | $ 22,254 | $ 41,823 | $ 75,890
Percentage of revenue | 9.00% | 11.00% | 10.00% | 10.00%
Americas Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 2,826 | $ 3,917 | $ 8,984 | $ 11,735
Percentage of revenue | 2.00% | 2.00% | 2.00% | 1.00%
Americas Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 45,577 | $ 75,963 | $ 159,310 | $ 279,345
Percentage of revenue | 36.00% | 36.00% | 37.00% | 36.00%
Asia and Pacific Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 1,652 | $ 13,267 | $ 6,114 | $ 56,535
Percentage of revenue | 1.00% | 6.00% | 2.00% | 7.00%
Asia/Pacific Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 3,934 | $ 5,877 | $ 13,503 | $ 22,719
Percentage of revenue | 3.00% | 3.00% | 3.00% | 3.00%
Asia/Pacific Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 5,586 | $ 19,144 | $ 19,617 | $ 79,254
Percentage of revenue | 4.00% | 9.00% | 5.00% | 10.00%
Middle East Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 6,953 | $ 5,359 | $ 19,979 | $ 17,800
Percentage of revenue | 6.00% | 3.00% | 5.00% | 2.00%
Middle East Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 13,694 | $ 20,897 | $ 48,344 | $ 69,393
Percentage of revenue | 11.00% | 9.00% | 11.00% | 9.00%
Middle East fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 20,647 | $ 26,256 | $ 68,323 | $ 87,193
Percentage of revenue | 17.00% | 12.00% | 16.00% | 11.00%
Africa/Europe Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 21,748 | $ 42,692 | $ 79,342 | $ 165,327
Percentage of revenue | 17.00% | 20.00% | 18.00% | 22.00%
Africa/Europe Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 26,087 | $ 36,084 | $ 79,938 | $ 120,995
Percentage of revenue | 21.00% | 17.00% | 19.00% | 15.00%
Africa And Europe Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 5,475 | $ 12,769 | $ 20,381 | $ 43,238
Percentage of revenue | 5.00% | 6.00% | 5.00% | 6.00%
Africa/Europe Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 53,310 | $ 91,545 | $ 179,661 | $ 329,560
Percentage of revenue | 43.00% | 43.00% | 42.00% | 43.00%
Worldwide Fleet Deepwater vessels |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 61,199 | $ 111,110 | $ 213,938 | $ 431,382
Percentage of revenue | 49.00% | 52.00% | 50.00% | 56.00%
Worldwide Fleet Towing-Supply/supply |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 55,620 | $ 85,112 | $ 183,608 | $ 288,997
Percentage of revenue | 44.00% | 40.00% | 43.00% | 37.00%
Worldwide Fleet Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 8,301 | $ 16,686 | $ 29,365 | $ 54,973
Percentage of revenue | 7.00% | 8.00% | 7.00% | 7.00%
Worldwide Fleet |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Vessel revenues | $ 125,120 | $ 212,908 | $ 426,911 | $ 775,352
Percentage of revenue | 100.00% | 100.00% | 100.00% | 100.00%

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