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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,418,461	$ 1,229,998	$ 1,060,468
Americas Fleet Deepwater
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	263,750	179,032	146,950
Percentage of revenue	18.00%	15.00%	14.00%
Americas Fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	115,055	120,817	143,796
Percentage of revenue	8.00%	10.00%	14.00%
Americas Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	31,926	27,210	33,783
Percentage of revenue	3.00%	2.00%	3.00%
Americas Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	410,731	327,059	324,529
Percentage of revenue	29.00%	27.00%	31.00%
Asia and Pacific Fleet Deepwater
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	88,191	96,118	75,495
Percentage of revenue	6.00%	8.00%	7.00%
Asia/Pacific Fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	62,630	84,217	73,845
Percentage of revenue	5.00%	7.00%	7.00%
Asia and Pacific Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	3,797	3,679	4,412
Asia and Pacific Fleet Other | Maximum
Segment and Geographic Distribution of Operations [Line Items]
Percentage of revenue	1.00%	1.00%	1.00%
Asia/Pacific Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	154,618	184,014	153,752
Percentage of revenue	11.00%	15.00%	14.00%
Middle East/North Africa Fleet Deepwater
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	66,503	55,945	46,511
Percentage of revenue	5.00%	5.00%	4.00%
Middle East/North Africa Fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	116,720	89,902	56,902
Percentage of revenue	8.00%	7.00%	5.00%
Middle East and North Africa Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	3,301	3,565	6,076
Percentage of revenue			1.00%
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	186,524	149,412	109,489
Percentage of revenue	13.00%	12.00%	10.00%
Sub-Saharan Africa/Europe Fleet Deepwater
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	364,722	273,544	199,697
Percentage of revenue	26.00%	22.00%	19.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	231,224	226,357	201,463
Percentage of revenue	16.00%	18.00%	19.00%
Sub Saharan Africa And Europe Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	70,642	69,612	71,538
Percentage of revenue	5.00%	6.00%	7.00%
Sub-Saharan Africa/Europe Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	666,588	569,513	472,698
Percentage of revenue	47.00%	46.00%	45.00%
Worldwide Fleet Deepwater
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	783,166	604,639	468,653
Percentage of revenue	55.00%	50.00%	44.00%
Worldwide Fleet Towing-Supply
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	525,629	521,293	476,006
Percentage of revenue	37.00%	42.00%	45.00%
Worldwide Fleet Other
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	109,666	104,066	115,809
Percentage of revenue	8.00%	8.00%	11.00%
Worldwide Fleet
Segment and Geographic Distribution of Operations [Line Items]
Vessel revenues	$ 1,418,461	$ 1,229,998	$ 1,060,468
Percentage of revenue	100.00%	100.00%	100.00%

X

- Definition

Sales revenue, services, percentage

+ References

No definition available.

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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

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