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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.