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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016
3.81% January 2014 notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 3.81% | 3.81%
Debt Instrument Maturity Period | [1] | January 2014 |
5.38% May 2012 notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 5.38% | 5.38%
Debt Instrument Maturity Period | [1] | May 2012 |
[1] | Notes require semi-annual principal payments.

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