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Indebtedness - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jul. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2019 | Mar. 01, 2018 | Feb. 01, 2018 | Dec. 31, 2017
Debt [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  | $ 25,953,000 |  |  |  | $ 21,300,000
Cash from acquisition used for repayment of debt |  |  | 43,806,000 |  |  |  |
Loss on early extinguishment of debt |  |  | (8,119,000) |  |  |  |
GulfMark | Term Loan Facility |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Cash from acquisition used for repayment of debt |  |  | 37,700,000 |  |  |  |
Cash on hand used for repayment of debt |  |  | 72,000,000 |  |  |  |
Repayment of outstanding debt |  |  | 100,000,000 |  |  |  |
Loss on early extinguishment of debt |  |  | 8,100,000 |  |  |  |
Borrowing capacity terminated amount |  |  | 25,000,000 |  |  |  |
Offer | Senior Notes | Maximum |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 25,400,000 |  |  | $ 24,700,000 |
8.00% New Secured Notes Due August 2022 |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate |  |  | 8.00% |  |  |  |
Aggregate principal amount | $ 350,000,000 | $ 350,000,000 | $ 350,000,000 |  |  |  |
Debt instrument maturity year |  | 2022 | 2022 |  |  |  |
8.00% New Secured Notes Due August 2022 | Offer |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Percentage of proceeds from Asset Sales, net of commission paid | 65.00% |  |  |  |  |  |
8.00% New Secured Notes Due August 2022 | Level 2 |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Fair value of debt outstanding |  |  | $ 359,400,000 |  |  |  |
8.00% New Secured Notes Due August 2022 | Plan of Reorganization |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Aug. 01, 2022 |  |  |  |
Debt instrument interest term |  |  | Interest on the Secured Notes accrues at a rate of 8.00% per annum and are 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 Secured Notes have quarterly minimum trailing twelve months interest coverage requirement that begins June 30, 2019. Minimum liquidity requirements and other covenants are set forth in the Indenture and are in effect from July 31, 2017. The Indenture also contains certain customary events of default and a make-whole provision. |  |  |  |
Debt instrument collateral description |  |  | the 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 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 of our Collateral or the Guarantors that is sold, transferred or otherwise disposed of by us 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. |  |  |  |
Tendered Notes |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 46,023 |  |
Tendered Notes | Subsequent Event |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 160,000 |  |  |

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