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Indebtedness - Senior Notes, Revolving Credit and Term Loan Agreement - Additional Information (Detail) - May. 31, 2015 - USD ($)	Total
Troms Offshore Supply AS | Senior Notes Due Twenty Twenty Seven [Member]
Debt [Line Items]
Debt instruments face amount	$ 31,300,000
Debt instrument maturity, month and year	2027-04
Semi-annual principal payments	$ 1,300,000
Debt instrument bearing floating interest rate	2.92%
Indebtedness rate	1.30%
Total capitalization rate	4.22%
Current Credit Facility
Debt [Line Items]
Credit facility expiration date	2019-06
Revolving credit facility	$ 900,000,000
Credit facility term	5 years
Revolving line of credit	$ 600,000,000
Term loan	$ 300,000,000

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-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 55



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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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