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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) kr in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 NOK (kr)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 NOK (kr)
Debt [Line Items]
Amount outstanding	$ 448,160
Predecessor
Debt [Line Items]
Amount outstanding			$ 2,040,525
Troms Offshore Supply AS | January 2014 notes
Debt [Line Items]
Amount outstanding	25,965	kr 212,500
Fair value in U.S. dollar equivalent	25,850
Troms Offshore Supply AS | January 2014 notes | Predecessor
Debt [Line Items]
Amount outstanding			26,167	kr 225,000
Fair value in U.S. dollar equivalent			26,133
Troms Offshore Supply AS | May 2012 notes
Debt [Line Items]
Amount outstanding	14,054	kr 115,020
Fair value in U.S. dollar equivalent	$ 14,013
Troms Offshore Supply AS | May 2012 notes | Predecessor
Debt [Line Items]
Amount outstanding			14,864	kr 127,800
Fair value in U.S. dollar equivalent			$ 14,793

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 210
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