Indebtedness - Additional Information (Detail)	12 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]
Covenant compliance description	The company failed to meet certain covenants contained in the Bank Loan Agreement, the Troms Offshore Debt agreement, and the September 2013 Senior Notes, which resulted in covenant noncompliance that would have allowed the respective lenders and/or the noteholders to declare us to be in default under each of the Funded Debt Agreements, and accelerate the indebtedness thereunder.

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration