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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) NOK in Thousands, $ in Thousands | Jun. 30, 2015 USD ($) | Jun. 30, 2015 NOK | Mar. 31, 2015 USD ($) | Mar. 31, 2015 NOK
--- | --- | --- | --- | ---
3.81% January 2014 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | [1] | $ 35,001 | NOK 275,000 | $ 34,234 | NOK 275,000
Fair value in U.S. dollar equivalent (Level 2) | [1] | 34,978 |  | 34,226 |
5.38% May 2012 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | [1] | 19,519 | 153,360 | 20,152 | 161,880
Fair value in U.S. dollar equivalent (Level 2) | [1] | 19,441 |  | 19,924 |
Variable rate borrowings, June 2013 borrowing agreement |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | [2] | $ 3,182 | NOK 25,000 | 3,112 | 25,000
Variable rate borrowings, May 2012 borrowing agreement |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-term debt outstanding | [2] |  |  | $ 2,490 | NOK 20,000
[1] | Notes require semi-annual principal payments.
[2] | Fair values approximate carrying values because the borrowings bear interest at variable rates.

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