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Indebtedness - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 4 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) Vessel | Jul. 31, 2017 USD ($) Vessel | Jul. 31, 2017 USD ($) Vessel | Sep. 30, 2017
Debt [Line Items] |  |  |  |
Debt instrument fixed interest rate | 8.00% | 8.00% | 8.00% |
Aggregate principal amount | $ 350 | $ 350 | $ 350 |
Debt instrument maturity year | 2022 |  |  |
Term loan, revolving line of credit and senior notes |  |  |  |
Debt [Line Items] |  |  |  |
Interest expense that would have been resulted if debt was not compromised |  |  | $ 27 |
Plan of Reorganization | Troms Offshore borrowings | Senior Notes |  |  |  |
Debt [Line Items] |  |  |  |
Plan effective date | Jul. 31, 2017 |  |  |
Modification description of debt instrument | (i) reduce by 50% the required principal payments due from the Effective Date through March 31, 2019, (ii) modestly increase the interest rates on amounts outstanding through April 2023, and (iii) provide for security and additional guarantees, including (a) mortgages on six vessels and related assignments of earnings and insurances, (b) share pledges by Troms Offshore and certain subsidiaries of Troms Offshore, and (c) guarantees by certain subsidiaries of Troms Offshore. |  |  |
Percentage of required principal payments due from effective date | 50.00% |  |  |
Number of vessels mortgaged | Vessel | 6 | 6 | 6 |
Weighted average interest rate |  |  |  | 5.01%
New Secured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Debt instrument fixed interest rate | 8.00% | 8.00% | 8.00% |
Aggregate principal amount | $ 350 | $ 350 | $ 350 |
Debt instrument maturity date |  | Dec. 30, 2022 |  |
New Secured Notes | Plan of Reorganization |  |  |  |
Debt [Line Items] |  |  |  |
Debt instrument maturity date | Aug. 01, 2022 |  |  |
Debt instrument interest term | Interest on the New Secured Notes will accrue at a rate of 8.00% per annum payable quarterly in arrears on February 1, May 1, August 1, and November 1 of each year in cash, beginning November 1, 2017. |  |  |
Debt instrument frequency of periodic payment of interest | quarterly |  |  |
Debt Instrument default description | The New Secured Notes have minimum interest coverage requirement (EBITDA/Interest), for which compliance will first be measured for the twelve months ending June 30, 2019. Minimum liquidity requirements and other covenants are set forth in the Indenture. The Indenture also contains certain customary events of default. |  |  |
Debt instrument collateral description | the New Secured Notes and the guarantees by the Guarantors will be secured by the Collateral (as defined in the Indenture) pursuant to the terms of the Indenture and the related security documents. The Trustee’s liens upon the Collateral and the right of the holders of the New Secured Notes to the benefits and proceeds of the Trustee’s liens on the Collateral will terminate and be discharged in certain circumstances described in the Indenture, including: (i) upon satisfaction and discharge of the Indenture in accordance with the terms thereof; or (ii) as to any Collateral of the company or the Guarantors that is sold, transferred or otherwise disposed of by the company or the Guarantors in a transaction or other circumstance that complies with the terms of the Indenture, at the time of such sale, transfer or other disposition. The company is obligated to offer to holders of the New Secured Notes under the Indenture to repurchase the New Secured Notes at par in amounts of up to 100% of asset sale proceeds depending upon the types of assets sold as defined in the Indenture. |  |  |
New Secured Notes | Plan of Reorganization | Maximum |  |  |  |
Debt [Line Items] |  |  |  |
Percentage of asset sale proceeds to repurchase notes at par amount | 100.00% |  |  |

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