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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail) | 6 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016
January 2014 3.81% notes |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | [1] | January 2014 |
Debt instrument interest rate | [1] | 3.81% | 3.81%
January 2014 3.81% notes | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt instrument maturity, in years |  | 12 years |
May 2012 5.38% notes |  |  |
Debt [Line Items] |  |  |
Debt Instrument Maturity Period | [1] | May 2012 |
Debt instrument interest rate | [1] | 5.38% | 5.38%
May 2012 5.38% notes | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Debt instrument maturity, in years |  | 12 years |
[1] | Troms Offshore debt requires semi-annual principal payments and has a 12 year maturity.

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