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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) - Troms Offshore Supply AS NOK in Thousands, $ in Thousands | Mar. 31, 2017 USD ($) | Mar. 31, 2017 NOK | Mar. 31, 2016 USD ($) | Mar. 31, 2016 NOK
--- | --- | --- | --- | ---
Debt [Line Items] |  |  |  |  |
Amount outstanding |  | $ 92,000 |  |  |
3.81% January 2014 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Amount outstanding | [1] | 26,167 | NOK 225,000 | $ 30,207 | NOK 250,000
Fair value in U.S. dollar equivalent | [1] | 26,133 |  | 30,199 |
5.38% May 2012 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Amount outstanding | [1] | 14,864 | NOK 127,800 | 17,500 | NOK 144,840
Fair value in U.S. dollar equivalent | [1] | $ 14,793 |  | $ 17,479 |
[1] | Note requires semi-annual principal payments.

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