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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
3.81% January 2014 notes
   
Debt [Line Items]    
Debt instrument interest rate 3.81% 3.81%
Debt Instrument Maturity Period January 2014 January 2014
5.38% May 2012 notes
   
Debt [Line Items]    
Debt instrument interest rate 5.38% 5.38%
Debt Instrument Maturity Period May 2012 May 2012
Variable rate borrowings, June 2013 borrowing agreement
   
Debt [Line Items]    
Debt instrument interest rate Variable rate [1] Variable rate [1]
Debt Instrument Maturity Period June 2013 [1] June 2013 [1]
Variable rate borrowings, May 2012 borrowing agreement
   
Debt [Line Items]    
Debt instrument interest rate Variable rate [1] Variable rate [1]
Debt Instrument Maturity Period May 2012 [1] May 2012 [1]
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.