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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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