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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015
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 |
Variable rate borrowings, June 2013 borrowing agreement |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [2] | Variable rate |
Debt Instrument Maturity Period | [2] | June 2013 |
Variable rate borrowings, May 2012 borrowing agreement |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [2] | Variable rate |
Debt Instrument Maturity Period | [2] | May 2012 |
[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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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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