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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |
Additions to properties and equipment | $ 128,411 | $ 220,309
Sub-Saharan Africa/Europe | Troms Offshore Supply AS |  |
Segment Reporting Information [Line Items] |  |
Additions to properties and equipment |  | $ 245,600

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration