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Summary of Vessels Impaired and Amount of Impairment Incurred (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2017
USD ($)
Vessel
Sep. 30, 2018
USD ($)
Vessel
Jul. 31, 2017
USD ($)
Vessel
Sep. 30, 2018
USD ($)
Vessel
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period | Vessel   15 [1]   30 [2]
Amount of impairment incurred | $   $ 16,853 [3]   $ 24,254 [4]
Predecessor        
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]        
Number of vessels impaired in the period | Vessel 8 [1]   97 [2]  
Amount of impairment incurred | $ $ 21,325 [3]   $ 249,606 [4]  
[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.
[3] Refer to Note (14) for additional information regarding asset impairment.
[4] Refer to Note (14) for additional information regarding asset impairment.