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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) kr in Thousands, $ in Thousands	Dec. 31, 2017 NOK (kr)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 NOK (kr)	Mar. 31, 2017 USD ($)
Debt [Line Items]
Amount outstanding		$ 438,827
Troms Offshore Supply AS | January 2014 notes
Debt [Line Items]
Amount outstanding	kr 212,500	25,965
Fair value in U.S. dollar equivalent		25,850
Troms Offshore Supply AS | May 2012 notes
Debt [Line Items]
Amount outstanding	kr 115,020	14,054
Fair value in U.S. dollar equivalent		$ 14,013
Predecessor
Debt [Line Items]
Fair value in U.S. dollar equivalent				$ 280,000
Predecessor | Troms Offshore Supply AS | January 2014 notes
Debt [Line Items]
Amount outstanding			kr 225,000	26,167
Fair value in U.S. dollar equivalent				26,133
Predecessor | Troms Offshore Supply AS | May 2012 notes
Debt [Line Items]
Amount outstanding			kr 127,800	14,864
Fair value in U.S. dollar equivalent				$ 14,793

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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