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Additional Detail for Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) NOK in Thousands, $ in Thousands		Dec. 31, 2016 USD ($)	Dec. 31, 2016 NOK	Mar. 31, 2016 USD ($)	Mar. 31, 2016 NOK
Debt [Line Items]
Amount outstanding		$ 2,043,001		$ 2,052,270
January 2014 3.81% notes
Debt [Line Items]
Amount outstanding	[1]	27,487	NOK 237,500	30,207	NOK 250,000
Fair value of debt outstanding	[1]	27,442		30,199
May 2012 5.38% notes
Debt [Line Items]
Amount outstanding	[1]	14,791	NOK 127,800	17,500	NOK 144,840
Fair value of debt outstanding	[1]	$ 14,767		$ 17,479
[1] Troms Offshore debt requires semi-annual principal payments and has a 12 year maturity.

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

+ References

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
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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