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Debt Costs (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
Debt [Line Items]        
Interest and debt costs incurred, net of interest capitalized   $ 13,009 $ 30,439  
Interest costs capitalized   101 521  
Total interest and debt costs   $ 13,110 $ 30,960  
Predecessor        
Debt [Line Items]        
Interest and debt costs incurred, net of interest capitalized $ 11,179     $ 75,026
Interest costs capitalized 601     4,829
Total interest and debt costs $ 11,780     $ 79,855