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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Millions | 1 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2017 Vessel | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |  |
Date of petition for bankruptcy |  |  | May 17, 2017 |
Unamortized deferred gains credited to reorganization items on account of lease rejections |  |  | $ 105.9 |
Predecessor |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Deferred gains on sale/leaseback transactions |  | $ 3.0 |  | $ 23.4
Plan of Reorganization |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels rejected pursuant to court order | Vessel | 16 |  |  |
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 of emergence consideration withheld to be paid month and year |  |  | 2018-01 |
Plan of Reorganization | Predecessor |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Unresolved sale leaseback claims |  | $ 260.2 |  |

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