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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
Other Commitments [Line Items]      
Total lease expense $ 7,863 $ 3,076 $ 3,840
Office and other leases      
Other Commitments [Line Items]      
Total lease expense 1,697 1,861 $ 3,840
Vessel operating leases      
Other Commitments [Line Items]      
Total lease expense $ 6,166 $ 1,215