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Summary of Debt Outstanding (Parenthetical) (Detail) | Dec. 31, 2016 | Mar. 31, 2016
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May 2015 4.22% Notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 4.22% | 4.22%
March 2015 4.21% Notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 4.21% | 4.21%
January 2014 3.81% notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 3.81% | 3.81%
May 2012 5.38% notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 5.38% | 5.38%
[1] | Troms Offshore debt requires semi-annual principal payments and has a 12 year maturity.

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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