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Summary of Vessels Impaired and Amount of Impairment Incurred (Parenthetical) (Detail) - Vessel
 3 Months Ended 6 Months Ended
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.