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Debt Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Debt [Line Items]    
Interest and debt costs incurred, net of interest capitalized $ 7,599  
Interest costs capitalized 174  
Total interest and debt costs $ 7,773  
Predecessor    
Debt [Line Items]    
Interest and debt costs incurred, net of interest capitalized   $ 21,008
Interest costs capitalized   1,217
Total interest and debt costs   $ 22,225