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Summary of Significant Accounting Policies - Basic and Diluted Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Aug. 13, 2018
Sep. 30, 2018
Sep. 30, 2017
Aug. 13, 2018
Sep. 30, 2017
Earnings Per Share [Line Items]          
Basic income attributable to common stock, Per Share   $ 0.13      
Diluted income attributable to common stock, Per Share   $ 0.13      
Net income (loss)   $ 13,823      
Income allocable to unvested restricted shares   (51)      
Basic income attributable to common stock   13,772      
Diluted income attributable to common stock   $ 13,772      
Basic income attributable to common stock, Shares   105,448      
Effect of Dilutive Securities: Income allocable to unvested restricted shares, Shares   15      
Diluted income attributable to common stock, Shares   105,463      
Basic and diluted net loss attributable to common stock $ (16,865)   $ (24,736)    
Basic and diluted net loss attributable to common stock, Shares 15,468   14,796    
Net income (loss) per share – basic and diluted $ (1.09) $ 0.13 $ (1.67)    
Predecessor          
Earnings Per Share [Line Items]          
Net income (loss) $ (16,865)   $ (24,736) $ (92,754) $ (69,109)
Basic income attributable to common stock, Shares 15,468   14,796 15,262 14,591
Diluted income attributable to common stock, Shares 15,468   14,796 15,262 14,591
Basic and diluted net loss attributable to common stock       $ (92,754)  
Basic and diluted net loss attributable to common stock, Shares       15,262  
Net income (loss) per share – basic and diluted $ (1.09)   $ (1.67) $ (6.08) $ (4.74)