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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) NOK in Thousands, $ in Thousands | Jun. 30, 2016 USD ($) | Jun. 30, 2016 NOK | Mar. 31, 2016 USD ($) | Mar. 31, 2016 NOK
--- | --- | --- | --- | ---
3.81% January 2014 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [1] | $ 29,879 | NOK 250,000 | $ 30,207 | NOK 250,000
Fair value of debt outstanding | [1] | 29,846 |  | 30,199 |
5.38% May 2012 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [1] | 16,293 | NOK 136,320 | 17,500 | NOK 144,840
Fair value of debt outstanding | [1] | $ 16,276 |  | $ 17,479 |
[1] | Notes require semi-annual principal payments.

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