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Indebtedness - Senior Debt Notes - Additional Information (Detail) $ in Thousands, NOK in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2013 USD ($) | Sep. 30, 2013 USD ($) | Aug. 15, 2011 USD ($) | May 27, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | May 31, 2012 NOK | Mar. 31, 2017 USD ($) Trom | Mar. 31, 2017 USD ($) Trom | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2017 NOK Trom | Jun. 30, 2016 | Jan. 31, 2014 NOK
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax loss relating to interest rate hedges |  |  |  |  |  |  |  |  | $ 1,530 | $ 143 | $ 717 |  |  |  |
Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  |  | $ 92,000 | $ 92,000 |  |  |  |  |  |
Number of Troms Offshore Debt tranches | Trom |  |  |  |  |  |  |  | 4 | 4 |  |  |  | 4 |  |
Notes Due April 2027 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  | 2027-04 |  |  |  |  |  |  |  |  |  |  |
Debt instruments face amount |  |  |  | $ 31,300 |  |  |  |  |  |  |  |  |  |  |
Semi-annual principal payments |  |  |  | $ 1,300 |  |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  | 2.92% |  |  |  |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  | 4.42% |  |  |  |  |  |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  |  | $ 27,400 | $ 27,400 |  |  |  |  |  |
Notes Due January 2027 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  | 2027-01 |  |  |  |  |  |  |  |  |  |
Debt instruments face amount |  |  |  |  | $ 29,500 |  |  |  |  |  | $ 29,500 |  |  |  |
Semi-annual principal payments |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  |  | 2.91% |  |  |  |  |  | 2.91% |  |  |  |
Indebtedness rate |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  | 4.41% |  |  |  |  |  | 4.41% |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  |  | 24,600 | 24,600 |  |  |  |  |  |
Notes Due January 2026 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  |  | 2026-01 |  |  |  |  |  |  |  |  |
Debt instruments face amount | NOK |  |  |  |  |  |  |  |  |  |  |  |  |  |  | NOK 300.0
Semi-annual principal payments |  |  |  |  |  | $ 12,500 |  |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.31%
Debt instrument outstanding amount |  |  |  |  |  |  |  | 26,200 | 26,200 |  |  |  | NOK 225.0 |  |
Notes Due May 2024 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  |  |  | 2024-05 |  |  |  |  |  |  |  |
Debt instruments face amount | NOK |  |  |  |  |  |  | NOK 204.4 |  |  |  |  |  |  |  |
Semi-annual principal payments | NOK |  |  |  |  |  |  | NOK 8.5 |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.88%
Debt instrument outstanding amount |  |  |  |  |  |  |  | $ 14,900 | $ 14,900 |  |  |  | NOK 127.8 |  |
Debt instrument fixed interest rate |  |  |  |  |  |  | 3.88% |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 300.00% | 300.00% |  |  |  | 300.00% | 300.00% |
Minimum | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 300.00% | 300.00% |  |  |  | 300.00% |  |
Minimum | Notes Due January 2026 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.31%
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |
Maximum | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |
September 2013 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note issuable amount under purchase agreement |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding | $ 200,000 | $ 300,000 |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
September 2013 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 300.00% | 300.00% |  |  |  | 300.00% |  |
September 2013 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |
August 2011 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  |  | $ 165,000 |  |  |  |  |  |  |  |  |  |  |  |
August 2011 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |
August 2011 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |
September 2010 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 425,000 |  |  |
After-tax loss relating to interest rate hedges |  |  |  |  |  |  |  | $ (1,300) |  | (1,500) |  |  |  |  |
Pre-tax loss relating to interest rate hedges |  |  |  |  |  |  |  | (2,400) |  | $ (2,400) |  |  |  |  |
September 2010 Senior Unsecured Notes | Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax loss relating to interest rate hedges |  |  |  |  |  |  |  | (1,300) |  |  |  |  |  |  |
Pre-tax loss relating to interest rate hedges |  |  |  |  |  |  |  | $ (2,400) |  |  |  |  |  |  |
September 2010 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
September 2010 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |

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