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Summary of Vessels Impaired and Amount of Impairment Incurred (Parenthetical) (Detail) - Vessel | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |
Number of vessels impaired in the period | [1] | 2 |  | 15 |
Stacked Vessels |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |
Number of vessels impaired in the period |  | 2 |  | 15 |
Predecessor |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |
Number of vessels impaired in the period | [1] |  | 77 |  | 89
Predecessor | Stacked Vessels |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |
Number of vessels impaired in the period |  |  | 72 |  | 83
Predecessor | Active Vessels |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |
Number of vessels impaired in the period |  |  | 5 |  | 6
[1] | For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.

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