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Allocation of Purchase Price for Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2014 Troms Offshore Supply AS	Jun. 04, 2013 Troms Offshore Supply AS
Business Combination Allocation of Purchase Price [Line Items]
Cash							$ 22,263
Trade receivables and other current assets							9,816
Vessels							245,605
Goodwill	283,699	297,822	[1]	297,822	[1]	42,200	42,160
Payable and other liabilities							(13,020)
Notes payable							(156,824)
Total purchase price							$ 150,000
[1] The total carrying amount of goodwill at March 31, 2012 is net of accumulated impairment charges $30.9 million related to the Middle East/North Africa segment.

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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.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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