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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) NOK in Thousands, $ in Thousands		Jun. 30, 2016 USD ($)	Jun. 30, 2016 NOK	Mar. 31, 2016 USD ($)	Mar. 31, 2016 NOK
3.81% January 2014 notes
Debt [Line Items]
Long-Term Debt Outstanding	[1]	$ 29,879	NOK 250,000	$ 30,207	NOK 250,000
Fair value of debt outstanding	[1]	29,846		30,199
5.38% May 2012 notes
Debt [Line Items]
Long-Term Debt Outstanding	[1]	16,293	NOK 136,320	17,500	NOK 144,840
Fair value of debt outstanding	[1]	$ 16,276		$ 17,479
[1] Notes require semi-annual principal payments.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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