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Summary of Debt Outstanding (Parenthetical) (Detail)	3 Months Ended	9 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Jul. 31, 2017
8.00% New Secured Notes Due August 2022
Debt [Line Items]
Debt Instrument Maturity Period		August 2022
Debt instrument interest rate		8.00%	8.00%
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period		May 2024
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	May 2024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period		January 2026
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	January 2026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period		January 2027
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	January 2026
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period		April 2027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	April 2027
Bank Term Loan Due July Two Thousand Nineteen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	July 2019
Three Point Nine Zero Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2017
Debt instrument interest rate	3.90%
Three Point Nine Five Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2017
Debt instrument interest rate	3.95%
Four Point One Two Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2018
Debt instrument interest rate	4.12%
Four Point One Seven Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2018
Debt instrument interest rate	4.17%
Four Point Three Three Percent September Two Thousand Ten Senior Notes Due December Two Thousand Nineteen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2019
Debt instrument interest rate	4.33%
Four Point Five One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2020
Debt instrument interest rate	4.51%
Four Point Five Six Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2020
Debt instrument interest rate	4.56%
Four Point Six One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty Two [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	December 2022
Debt instrument interest rate	4.61%
Four Point Zero Six Percent August Two Thousand Eleven Senior Notes Due March Two Thousand Nineteen [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	March 2019
Debt instrument interest rate	4.06%
Four Point Five Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	June 2021
Debt instrument interest rate	4.54%
Four Point Six Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	June 2021
Debt instrument interest rate	4.64%
Four Point Two Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	November 2020
Debt instrument interest rate	4.26%
Five Point Zero One Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Three [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	November 2023
Debt instrument interest rate	5.01%
Five Point One Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Five [Member] | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	November 2025
Debt instrument interest rate	5.16%
Revolving Credit Facility | Revolving Line Of Credit Due July 2019 | Predecessor
Debt [Line Items]
Debt Instrument Maturity Period	July 2019

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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