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Stockholders' Equity - Additional Information (Detail) - $ / shares
 9 Months Ended
Aug. 14, 2018
Sep. 30, 2018
Sep. 30, 2017
Aug. 10, 2018
Dec. 31, 2017
Stockholders Equity [Line Items]          
Common stock, shares authorized   155,000,000      
Common stock, par value   $ 0.50      
Jones contribution transaction, Shares issued 88,571,429        
Exercise price of warrants for common stock   $ 0.01      
Common stock warrants exercised, Shares   402,708      
Remaining warrants expired without being exercised   11,955      
Predecessor          
Stockholders Equity [Line Items]          
Total authorized shares       160,000,000  
Common stock, shares authorized       155,000,000 75,000,000
Common stock, par value       $ 0.50 $ 0.50
Preferred stock, shares authorized       5,000,000  
Preferred stock, par value       $ 10.00  
Common stock warrants exercised, Shares     246,793