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Indebtedness - Senior Debt Notes - Additional Information (Detail)	12 Months Ended		3 Months Ended				3 Months Ended		1 Months Ended						1 Months Ended								1 Months Ended			12 Months Ended	1 Months Ended				12 Months Ended			1 Months Ended	12 Months Ended							1 Months Ended	12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Jun. 30, 2013 Troms Offshore Supply AS USD ($)	Jun. 30, 2013 Troms Offshore Supply AS NOK	Mar. 31, 2014 Troms Offshore Supply AS USD ($)	Mar. 31, 2014 Troms Offshore Supply AS NOK	Sep. 30, 2013 Troms Offshore Supply AS Public bonds USD ($)	Sep. 30, 2013 Troms Offshore Supply AS Public bonds NOK	Jan. 31, 2014 Troms Offshore Supply AS Notes Due May 2024	May 31, 2012 Troms Offshore Supply AS Notes Due May 2024 NOK	Mar. 31, 2014 Troms Offshore Supply AS Notes Due May 2024 USD ($)	Mar. 31, 2014 Troms Offshore Supply AS Notes Due May 2024 NOK	May 31, 2012 Troms Offshore Supply AS Notes Due May 2015 NOK	Jun. 30, 2013 Troms Offshore Supply AS Senior Notes Due 2019 NOK	Jan. 31, 2014 Troms Offshore Supply AS Notes Due January 2026 NOK	Mar. 31, 2014 Troms Offshore Supply AS Notes Due January 2026 USD ($)	Mar. 31, 2014 Troms Offshore Supply AS Notes Due January 2026 NOK	Mar. 31, 2014 Troms Offshore Supply AS Floating rate debt USD ($)	Mar. 31, 2014 Troms Offshore Supply AS Floating rate debt NOK	Mar. 31, 2014 Troms Offshore Supply AS Fixed rate debt USD ($)	Mar. 31, 2014 Troms Offshore Supply AS Fixed rate debt NOK	Mar. 31, 2014 Minimum	May 31, 2012 Minimum Troms Offshore Supply AS Notes Due May 2015	Jun. 30, 2013 Minimum Troms Offshore Supply AS Senior Notes Due 2019	Jan. 31, 2014 Minimum Troms Offshore Supply AS Notes Due January 2026	Mar. 31, 2014 Maximum	May 31, 2012 Maximum Troms Offshore Supply AS Notes Due May 2015	Jun. 30, 2013 Maximum Troms Offshore Supply AS Senior Notes Due 2019	Nov. 15, 2013 September 2013 Senior Unsecured Notes USD ($)	Sep. 30, 2013 September 2013 Senior Unsecured Notes USD ($)	Mar. 31, 2014 September 2013 Senior Unsecured Notes USD ($)	Mar. 31, 2014 September 2013 Senior Unsecured Notes Minimum	Mar. 31, 2014 September 2013 Senior Unsecured Notes Maximum	Aug. 15, 2011 August 2011 Senior Unsecured Notes USD ($)	Mar. 31, 2014 August 2011 Senior Unsecured Notes Minimum	Mar. 31, 2014 August 2011 Senior Unsecured Notes Maximum	Mar. 31, 2014 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2013 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2011 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2014 September 2010 Senior Unsecured Notes Minimum	Mar. 31, 2014 September 2010 Senior Unsecured Notes Maximum	Jul. 31, 2003 July 2003 Senior Unsecured Notes USD ($)	Mar. 31, 2014 July 2003 Senior Unsecured Notes Minimum	Mar. 31, 2014 July 2003 Senior Unsecured Notes Maximum
Debt [Line Items]
Senior note issuable amount under purchase agreement																														$ 500,000,000
Sale of debt outstanding																													200,000,000	300,000,000	500,000,000			165,000,000					425,000,000			300,000,000
Debt instrument maturity, in years																																7 years	12 years		8 years	10 years				5 years	12 years		7 years	12 years
Consolidated debt to consolidated total capitalization, ratio																										55.00%							55.00%			55.00%					55.00%			55.00%
Interest coverage ratio																						300.00%										300.00%
After-tax loss relating to interest rate hedges																																					2,400,000	2,900,000
Pre-tax loss relating to interest rate hedges																																					3,700,000	4,400,000
Debt instruments face amount										204,400,000			35,000,000	25,000,000	300,000,000
Debt instrument maturity, month and year										2024-05			2015-05	2019-06	2026-01
Semi-annual principal payments										8,500,000					12,500,000
Debt instrument bearing floating interest rate																									2.31%
Indebtedness rate									1.50%						1.50%
Total capitalization rate									5.38%						3.81%
Debt instrument outstanding amount	1,514,870,000	1,000,000,000			10,000,000	60,000,000					29,800,000	178,900,000				50,000,000	300,000,000	10,000,000	60,000,000	79,900,000	478,900,000
Debt instrument bearing interest rate									3.88%	6.38%
Interest rate																							2.00%	2.00%			3.50%	3.50%
Debt instrument estimated fair value																				79,600,000	477,500,000
Debt extinguished amount			32,500,000	188,900,000			82,100,000	500,000,000
Repayment of bond at average price as a percentage of par value							105.00%	105.00%
Loss on early extinguishment of bond	$ (4,144,000)						$ 4,100,000	26,000,000

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