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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, U_pure in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Stockholders Equity Note [Line Items]        
Shares repurchased during period, shares 0 0 0 0
Dividends declared | $ $ 0 $ 0 $ 0 $ 0
New creditors Warrant Issued   11,543,814 2,220,857  
Warrant exercisable conversion ratio     1,100  
September 2010 Senior Unsecured Notes        
Stockholders Equity Note [Line Items]        
Remaining other comprehensive loss related to interest rate, swap after-tax | $       1,300,000
Remaining other comprehensive loss related to interest rate, swap pre-tax | $       $ 2,400,000
Creditor Warrants        
Stockholders Equity Note [Line Items]        
Nominal exercise price of warrants | $ / shares     $ 0.01  
Stock issued during period, Value | $     $ 2,300,000  
Stock issued during period, shares, acquisitions     2,189,709  
Equity Warrants        
Stockholders Equity Note [Line Items]        
Nominal exercise price of warrants | $ / shares     $ 100  
Stock issued during period, Value | $     $ 800,000  
Stock issued during period, shares, acquisitions     0  
Series A Warrants        
Stockholders Equity Note [Line Items]        
New creditors Warrant Issued   2,432,432 0  
Nominal exercise price of warrants | $ / shares   $ 57,060,000    
Series B Warrants        
Stockholders Equity Note [Line Items]        
New creditors Warrant Issued   2,629,657 0  
Nominal exercise price of warrants | $ / shares   $ 62,280,000