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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 381,510 | $ 331,630
Americas Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 82,282 | 55,032
Percentage of revenue | 21.00% | 17.00%
Americas Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 29,517 | 27,670
Percentage of revenue | 8.00% | 8.00%
Americas Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 8,184 | 7,542
Percentage of revenue | 2.00% | 2.00%
Americas Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 119,983 | 90,244
Percentage of revenue | 31.00% | 27.00%
Asia and Pacific Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 24,242 | 24,292
Percentage of revenue | 7.00% | 7.00%
Asia/Pacific Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 15,037 | 17,722
Percentage of revenue | 4.00% | 6.00%
Asia and Pacific Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 970 | 942
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 | 40,249 | 42,956
Percentage of revenue | 11.00% | 13.00%
Middle East/North Africa Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 19,467 | 15,852
Percentage of revenue | 5.00% | 5.00%
Middle East/North Africa Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 35,279 | 24,497
Percentage of revenue | 9.00% | 7.00%
Middle East and North Africa Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 793 | 864
Middle East and North Africa Fleet Other | Maximum |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Percentage of revenue | 1.00% | 1.00%
Middle East/North Africa |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 55,539 | 41,213
Percentage of revenue | 15.00% | 13.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 91,691 | 87,251
Percentage of revenue | 24.00% | 26.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 55,436 | 54,860
Percentage of revenue | 14.00% | 17.00%
Sub Saharan Africa And Europe Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 18,612 | 15,106
Percentage of revenue | 5.00% | 4.00%
Sub-Saharan Africa/Europe Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 165,739 | 157,217
Percentage of revenue | 43.00% | 47.00%
Worldwide Fleet Deepwater vessels |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 217,682 | 182,427
Percentage of revenue | 57.00% | 55.00%
Worldwide Fleet Towing-Supply/supply |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 135,269 | 124,749
Percentage of revenue | 35.00% | 38.00%
Worldwide Fleet Other |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | 28,559 | 24,454
Percentage of revenue | 8.00% | 7.00%
Worldwide Fleet |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Vessel revenues | $ 381,510 | $ 331,630
Percentage of revenue | 100.00% | 100.00%

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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