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Sale/ Leaseback Arrangements - Additional Information (Detail) | 1 Months Ended | 4 Months Ended | 6 Months Ended
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May 31, 2017 Vessel | Jul. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) Claim
Sale Leaseback Transaction [Line Items] |  |  |
Costs incurred to leased vessels, description |  |  | Costs incurred subsequent to the Petition Date to mobilize those vessels and prepare them for re-delivery to the lessors has been included in reorganization items for the period August 1, 2017 through September 30, 2017 (Successor)
Date of petition for bankruptcy |  |  | May 17, 2017
Unamortized deferred gains credited to reorganization items on account of lease rejections |  |  | $ 105,900,000
Predecessor |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Deferred gains on sale/leaseback transactions |  | $ 3,000,000 |
Plan of Reorganization |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Number of vessels rejected pursuant to court order | Vessel | 16 |  |
Number of claims settled | Claim |  |  | 5
Claims settled aggregate amount |  |  | $ 166,100,000
Number of claims reserved | Claim |  |  | 1
Claims reserved amount remained outstanding |  |  | $ 94,100,000
Number of vessels operating throughout the world | Vessel | 6 |  |
Plan of Reorganization | Maximum |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Claims reserved amount remained outstanding |  |  | $ 94,100,000
Plan of Reorganization | Predecessor |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Included in liabilities subject to compromise related to claims of sale leaseback parties |  | $ 260,200,000 |

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