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Summary of Aggregate Operating Lease Expenses (Detail) - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
Other Commitments [Line Items]        
Total lease expense   $ 3,076 $ 3,840  
Office and other leases        
Other Commitments [Line Items]        
Total lease expense   1,861 $ 3,840  
Vessel operating leases        
Other Commitments [Line Items]        
Total lease expense   $ 1,215    
Predecessor        
Other Commitments [Line Items]        
Total lease expense $ 7,863     $ 38,898
Predecessor | Office and other leases        
Other Commitments [Line Items]        
Total lease expense 1,697     5,132
Predecessor | Vessel operating leases        
Other Commitments [Line Items]        
Total lease expense $ 6,166     $ 33,766