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Summary of Combined Fair Value of Assets Incurred Impairments (Parenthetical) (Detail) - Vessel
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period [1] 13  
Stacked Vessels    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period 13  
Predecessor    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period [1]   28
Predecessor | Stacked Vessels    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period   25
Predecessor | Active Vessels    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period   3
[1] For the quarter ended March 31, 2018, there were 13 stacked vessels impaired, and for the quarter ended March 31, 2017, there were 25 stacked vessels and 3 active vessels impaired.