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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail)
NOK in Thousands, $ in Thousands
Sep. 30, 2015
USD ($)
Sep. 30, 2015
NOK
Mar. 31, 2015
USD ($)
Mar. 31, 2015
NOK
3.81% January 2014 notes        
Debt [Line Items]        
Long-term debt outstanding [1] $ 30,792 NOK 262,500 $ 34,234 NOK 275,000
Fair value in U.S. dollar equivalent (Level 2) [1] 30,797   34,226  
5.38% May 2012 notes        
Debt [Line Items]        
Long-term debt outstanding [1] 17,989 NOK 153,360 20,152 161,880
Fair value in U.S. dollar equivalent (Level 2) [1] $ 17,995   19,924  
Variable rate borrowings, June 2013 borrowing agreement        
Debt [Line Items]        
Long-term debt outstanding [2],[3]     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.
[3] Remaining note balance was repaid in September 2015. The company recognized a $0.1 million gain on early extinguishment.