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Allocation of Purchase Price for Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2013 | Jun. 04, 2013 Troms Offshore Supply AS
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Business Combination Allocation of Purchase Price [Line Items] |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ 22,263 |
Trade receivables and other current assets |  |  |  |  |  |  |  |  | 9,816 |
Vessels |  |  |  |  |  |  |  |  | 245,605 | [1]
Goodwill | 283,699 | [2] | 283,699 | [2] | 339,982 | [3] | 297,822 | [3] | 42,160 |
Payable and other liabilities |  |  |  |  |  |  |  |  | (13,020) |
Notes payable |  |  |  |  |  |  |  |  | (156,824) |
Total purchase price |  |  |  |  |  |  |  |  | $ 150,000 |
[1] | Includes $10.7 million in costs attributed to vessels under construction.
[2] | The total carrying amount of goodwill at September 30, 2014 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively.
[3] | The total carrying amount of goodwill at September 30, 2013 is net of accumulated impairment charges $30.9 million related to the Middle East/North Africa segment.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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