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Summary of Vessels Impaired and Amount of Impairment Incurred (Parenthetical) (Detail) - Vessel
 1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2018
Jul. 31, 2017
Sep. 30, 2018
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period   15 [1]   30 [2]
Stacked Vessels        
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period   15   30
Predecessor        
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period 8 [1]   97 [2]  
Predecessor | Stacked Vessels        
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period 7   90  
Predecessor | Active Vessels        
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period 1   7  
[1] For the three month period ended September 30, 2018, (Successor) there were 15 stacked vessels impaired. For the period July 1 through July 31, 2017 there were seven stacked vessels and one active vessel impaired.
[2] For the nine month period ended September 30, 2018, (Successor) there were 30 stacked vessels impaired. For the period January 1 through July 31, 2017 there were 90 stacked vessels and seven active vessels impaired.