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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail)
In Thousands, unless otherwise specified
Sep. 30, 2014
3.81% January 2014 notes
USD ($)
Sep. 30, 2014
3.81% January 2014 notes
NOK
Mar. 31, 2014
3.81% January 2014 notes
USD ($)
Mar. 31, 2014
3.81% January 2014 notes
NOK
Sep. 30, 2014
5.38% May 2012 notes
USD ($)
Sep. 30, 2014
5.38% May 2012 notes
NOK
Mar. 31, 2014
5.38% May 2012 notes
USD ($)
Mar. 31, 2014
5.38% May 2012 notes
NOK
Sep. 30, 2014
Variable rate borrowings, June 2013 borrowing agreement
USD ($)
Sep. 30, 2014
Variable rate borrowings, June 2013 borrowing agreement
NOK
Mar. 31, 2014
Variable rate borrowings, June 2013 borrowing agreement
USD ($)
Mar. 31, 2014
Variable rate borrowings, June 2013 borrowing agreement
NOK
Sep. 30, 2014
Variable rate borrowings, May 2012 borrowing agreement
USD ($)
Sep. 30, 2014
Variable rate borrowings, May 2012 borrowing agreement
NOK
Mar. 31, 2014
Variable rate borrowings, May 2012 borrowing agreement
USD ($)
Mar. 31, 2014
Variable rate borrowings, May 2012 borrowing agreement
NOK
Debt [Line Items]                                
Long-term debt outstanding $ 46,434 287,500 $ 50,028 300,000 $ 27,521 170,400 $ 29,867 178,920 $ 4,038 [1] 25,000 [1] $ 4,168 [1] 25,000 [1] $ 3,230 [1] 20,000 [1] $ 5,837 [1] 35,000 [1]
Fair value in U.S. dollar equivalent (Level 2) $ 46,442   $ 50,044   $ 27,267   $ 29,588                  
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.