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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  | $ 92,000 |
September 2013 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 500,000 | $ 500,000
Weighted average remaining life in years |  | 6 years 4 months 24 days | 7 years 4 months 24 days
Weighted average coupon rate on notes outstanding |  | 4.86% | 4.86%
Fair value of debt outstanding |  | $ 280,000 | $ 342,746
August 2011 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 165,000 | $ 165,000
Weighted average remaining life in years |  | 3 years 7 months 6 days | 4 years 7 months 6 days
Weighted average coupon rate on notes outstanding |  | 4.42% | 4.42%
Fair value of debt outstanding |  | $ 92,400 | $ 127,148
September 2010 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 382,500 | $ 382,500
Weighted average remaining life in years |  | 3 years 1 month 6 days | 4 years 1 month 6 days
Weighted average coupon rate on notes outstanding |  | 4.35% | 4.35%
Fair value of debt outstanding |  | $ 214,200 | $ 302,832
May 2015 notes | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Fair value of debt outstanding | [1] | 27,395 | 30,062
Amount outstanding | [1] | 27,421 | 30,033
March 2015 notes | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Fair value of debt outstanding | [1] | 24,544 | 27,027
Amount outstanding | [1] | $ 24,573 | $ 27,030
[1] | Note requires semi-annual principal payments.

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