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v3.10.0.1

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jul. 31, 2017
Predecessor |  |  |  |
Debt [Line Items] |  |  |  |
Fair value of debt outstanding | $ 280,000 |  |  |
Weighted average interest rate of debt borrowings | 4.86% |  |  |
Troms Offshore Supply AS |  |  |  |
Debt [Line Items] |  |  |  |
Weighted average interest rate of debt borrowings |  | 5.00% |  |
Description of frequency of periodic payments on notes |  | Semi-annually |  |
Level 2 | Troms Offshore Supply AS |  |  |  |
Debt [Line Items] |  |  |  |
Fair value of debt outstanding |  | $ 86,400 | $ 88,500 |
8.00% New Secured Notes Due August 2022 |  |  |  |
Debt [Line Items] |  |  |  |
Debt Instrument Maturity Period |  | August 2022 | August 2022 |
Debt instrument interest rate |  | 8.00% | 8.00% | 8.00%
Fair value of debt outstanding |  | $ 361,500 | $ 359,800 |
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |  |
Debt [Line Items] |  |  |  |
Debt Instrument Maturity Period |  | May 2024 | 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 | 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 | 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 | 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 |  |  |

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