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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 390,952	$ 363,668	$ 772,462	$ 695,298
Americas Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	91,403	61,811	173,685	116,843
Percentage of revenue	23.00%	17.00%	23.00%	17.00%
Americas Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	34,387	30,861	63,904	58,531
Percentage of revenue	9.00%	8.00%	8.00%	8.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	8,223	9,257	16,407	16,799
Percentage of revenue	2.00%	3.00%	2.00%	3.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	134,013	101,929	253,996	192,173
Percentage of revenue	34.00%	28.00%	33.00%	28.00%
Asia and Pacific Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	27,675	19,923	51,917	44,215
Percentage of revenue	7.00%	5.00%	7.00%	6.00%
Asia/Pacific Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	17,338	16,559	32,375	34,281
Percentage of revenue	5.00%	5.00%	4.00%	5.00%
Asia and Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	976	948	1,946	1,890
Asia and Pacific Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of revenue	1.00%	1.00%	1.00%	1.00%
Asia/Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	45,989	37,430	86,238	80,386
Percentage of revenue	12.00%	10.00%	11.00%	11.00%
Middle East/North Africa Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	19,254	15,732	38,721	31,584
Percentage of revenue	5.00%	5.00%	5.00%	5.00%
Middle East/North Africa Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	28,715	28,763	63,994	53,260
Percentage of revenue	7.00%	8.00%	9.00%	8.00%
Middle East and North Africa Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	868	875	1,661	1,739
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%	1.00%
Middle East/North Africa
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	48,837	45,370	104,376	86,583
Percentage of revenue	12.00%	13.00%	14.00%	13.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	89,193	106,541	180,884	193,792
Percentage of revenue	23.00%	29.00%	23.00%	28.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	54,617	56,772	110,053	111,632
Percentage of revenue	14.00%	16.00%	14.00%	16.00%
Sub Saharan Africa And Europe Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	18,303	15,626	36,915	30,732
Percentage of revenue	5.00%	4.00%	5.00%	4.00%
Sub-Saharan Africa/Europe Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	162,113	178,939	327,852	336,156
Percentage of revenue	42.00%	49.00%	42.00%	48.00%
Worldwide Fleet Deepwater vessels
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	227,525	204,007	445,207	386,434
Percentage of revenue	58.00%	56.00%	58.00%	56.00%
Worldwide Fleet Towing-Supply/supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	135,057	132,955	270,326	257,704
Percentage of revenue	35.00%	37.00%	35.00%	37.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	28,370	26,706	56,929	51,160
Percentage of revenue	7.00%	7.00%	7.00%	7.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 390,952	$ 363,668	$ 772,462	$ 695,298
Percentage of revenue	100.00%	100.00%	100.00%	100.00%

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Sales revenue, services, percentage

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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

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