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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Debt [Line Items] |  |  |
Debt instrument outstanding amount |  | $ 2,052,270 | $ 1,534,476
Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Fair value of debt outstanding | [1] | 30,062 |
Debt instrument outstanding amount | [1] | 30,033 |
Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Fair value of debt outstanding | [1] | 27,027 | 29,501
Debt instrument outstanding amount | [1] | 27,030 | 29,488
September 2013 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 500,000 | $ 500,000
Weighted average remaining life in years |  | 7 years 4 months 24 days | 8 years 4 months 24 days
Weighted average coupon rate on notes outstanding |  | 4.86% | 4.86%
Fair value of debt outstanding |  | $ 342,746 | $ 516,879
August 2011 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 165,000 | $ 165,000
Weighted average remaining life in years |  | 4 years 7 months 6 days | 5 years 7 months 6 days
Weighted average coupon rate on notes outstanding |  | 4.42% | 4.42%
Fair value of debt outstanding |  | $ 127,148 | $ 167,910
September 2010 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  | $ 382,500 | $ 425,000
Weighted average remaining life in years |  | 4 years 1 month 6 days | 4 years 7 months 6 days
Weighted average coupon rate on notes outstanding |  | 4.35% | 4.25%
Fair value of debt outstanding |  | $ 302,832 | $ 431,296
July 2003 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding |  |  | $ 35,000
Weighted average remaining life in years |  | 0 years | 3 months 18 days
Weighted average coupon rate on notes outstanding |  |  | 4.61%
Fair value of debt outstanding |  |  | $ 35,197
[1] | Note requires semi-annual principal payments.

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