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Indebtedness - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2013 Troms Offshore Supply AS Public bonds USD ($) | Sep. 30, 2013 Troms Offshore Supply AS Public bonds NOK | Sep. 30, 2013 Minimum Troms Offshore Supply AS Public bonds
Debt [Line Items] |  |  |  |  |
Debt extinguished amount |  |  | $ 82,100,000 | 500,000,000 |
Repayment of bond at average price as a percentage of par value |  |  | 105.00% | 105.00% |
Loss on early extinguishment of bond | $ (4,144,000) | $ (4,144,000) | $ 4,100,000 | 26,000,000 |
Interest rate |  |  |  |  | 5.40%
Debt instrument maturity, month and year |  |  | 2016-04 | 2016-04 |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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