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Summary of Combined Fair Value of Assets Incurred Impairments (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period | Vessel [1] 13  
Amount of impairment incurred [2] $ 6,186  
Combined fair value of assets incurring impairment $ 28,322  
Predecessor    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]    
Number of vessels impaired in the period | Vessel [1]   28
Amount of impairment incurred [2]   $ 64,857
Combined fair value of assets incurring impairment   $ 206,450
[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.
[2] Refer to Note (13) for additional information regarding asset impairment charges.