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Chapter 11 Proceedings and Emergence - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) Vessel $ / shares shares | Jul. 31, 2017 USD ($) Vessel $ / shares shares | Dec. 31, 2017 USD ($) shares | Aug. 01, 2017
Reorganizations [Line Items] |  |  |  |
Number of vessels leased | Vessel | 16 | 16 |  |
Claims paid in cash | $ 225.0 | $ 225.0 |  |
Percentage of common equity | 95.00% | 95.00% |  |
Debt instrument maturity year | 2022 |  |  |
Aggregate principal amount | $ 350.0 | $ 350.0 |  |
Bankruptcy claims, percentage of common equity issued to existing stockholders |  | 5.00% |  |
Purchase warrant exercise period |  |  | 6 years |
Warrants issued | shares |  |  | 924,125 |
Plan of Reorganization |  |  |  |
Reorganizations [Line Items] |  |  |  |
Settlement agreement description |  |  | The company successfully reached agreement with the Sale Leaseback Parties between August and November 2017. |
Claims settled amount |  |  | $ 233.6 |
Remainder period one of emergence consideration withheld to be paid month and year |  |  | 2017-12 |
Remainder period two of emergence consideration withheld to be paid month and year |  |  | 2018-01 |
Plan of Reorganization | Predecessor |  |  |  |
Reorganizations [Line Items] |  |  |  |
Additional sale leaseback claims | $ 260.2 | $ 260.2 |  |
Series A Warrants |  |  |  |
Reorganizations [Line Items] |  |  |  |
Warrants issued | shares | 2,400,000 | 2,400,000 |  |
Nominal exercise price of warrants | $ / shares | $ 57.06 | $ 57.06 |  |
Series B Warrants |  |  |  |
Reorganizations [Line Items] |  |  |  |
Warrants issued | shares | 2,600,000 | 2,600,000 |  |
Nominal exercise price of warrants | $ / shares | $ 62.28 | $ 62.28 |  |
Minimum | Non-U.S. Citizens |  |  |  |
Reorganizations [Line Items] |  |  |  |
Ownership percentage of common stock | 24.00% | 24.00% |  |
Minimum | Non-U.S. Citizens | New Creditor Warrant |  |  |  |
Reorganizations [Line Items] |  |  |  |
Ownership percentage of common stock |  |  |  | 24.00%
Maximum | Non-U.S. Citizens |  |  |  |
Reorganizations [Line Items] |  |  |  |
Ownership percentage of common stock | 25.00% | 25.00% |  |
8.00% New Secured Notes Due August 2022 |  |  |  |
Reorganizations [Line Items] |  |  |  |
Debt instrument fixed interest rate | 8.00% | 8.00% |  |
Debt instrument maturity year |  | 2022 |  |
Aggregate principal amount | $ 350.0 | $ 350.0 |  |

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