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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) In Thousands, unless otherwise specified	Jun. 30, 2014 3.81% January 2014 notes USD ($)	Jun. 30, 2014 3.81% January 2014 notes NOK	Mar. 31, 2014 3.81% January 2014 notes USD ($)	Mar. 31, 2014 3.81% January 2014 notes NOK	Jun. 30, 2014 5.38% May 2012 notes USD ($)	Jun. 30, 2014 5.38% May 2012 notes NOK	Mar. 31, 2014 5.38% May 2012 notes USD ($)	Mar. 31, 2014 5.38% May 2012 notes NOK	Jun. 30, 2014 Variable rate borrowings, June 2013 borrowing agreement USD ($)		Jun. 30, 2014 Variable rate borrowings, June 2013 borrowing agreement NOK		Mar. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement USD ($)		Mar. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement NOK		Jun. 30, 2014 Variable rate borrowings, May 2012 borrowing agreement USD ($)		Jun. 30, 2014 Variable rate borrowings, May 2012 borrowing agreement NOK		Mar. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement USD ($)		Mar. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement NOK
Debt [Line Items]
Long-term debt outstanding	$ 50,265	300,000	$ 50,028	300,000	$ 28,550	170,400	$ 29,867	178,920	$ 4,188	[1]	25,000	[1]	$ 4,168	[1]	25,000	[1]	$ 3,351	[1]	20,000	[1]	$ 5,837	[1]	35,000	[1]
Fair value in U.S. dollar equivalent (Level 2)	$ 50,302		$ 50,044		$ 28,467		$ 29,588
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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