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Summary of Vessels Impaired and Amount of Impairment Incurred (Parenthetical) (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) Vessel | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Jun. 30, 2018 USD ($) Vessel | Jun. 30, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($) Vessel
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  | $ 1,215 | [1] | $ 16,777 |  |  |  |  |  |  |  |  | $ 16,777 | [2] | $ 7,401 | [1] |  |  |  |
Number of vessels impaired in the period | Vessel |  | 2 | [3] |  |  |  |  |  |  |  |  |  | 5 |  | 15 | [3] |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments | $ 21,325 |  |  |  | $ 163,423 | [1] | $ 64,857 | $ 253,422 | $ 129,562 | $ 36,886 | $ 184,748 | [2] |  |  |  |  | $ 228,280 | [1] | $ 484,727 | [2]
Number of vessels impaired in the period | Vessel |  |  |  |  | 77 | [3] |  |  |  |  | 79 |  |  |  |  |  | 89 | [3] | 132 |
Inventory and other non-vessel assets. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |  |  |
Inventory and other non-vessel assets. | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200 |
Stacked Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,400 |  |  |  |  |  |  |
Number of vessels impaired in the period | Vessel |  | 2 |  |  |  |  |  |  |  |  |  |  | 5 |  | 15 |  |  |  |  |
Stacked Vessels | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  | $ 157,800 |  |  |  |  |  |  |  |  |
Number of vessels impaired in the period | Vessel |  |  |  |  | 72 |  |  |  |  |  | 73 |  |  |  |  |  | 83 |  |  |
Active Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Active Vessels | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  | $ 26,900 |  |  |  |  |  |  |  |  |
Number of vessels impaired in the period | Vessel |  |  |  |  | 6 |  |  |  |  |  | 6 |  |  |  |  |  | 6 |  |  |
[1] | Refer to Note (14) for additional information regarding asset impairment.
[2] | The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.
[3] | 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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