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Liquidity and Bankruptcy Proceedings - Real Alloy Bankruptcy Proceedings (Detail) - USD ($)
$ in Millions
Mar. 07, 2018
Jan. 31, 2018
Jan. 17, 2018
Nov. 21, 2017
Jan. 08, 2015
Debtor-in-Possession Financing          
Amount of outstanding notes which can be exchanged on a pro rata basis for new Roll Up DIP Term Notes     $ 170.0    
New Money DIP Term Notes          
Debtor-in-Possession Financing          
Stated interest rate       11.50%  
New Money DIP Term Notes | Maximum          
Debtor-in-Possession Financing          
DIP financing arranged     85.0    
New Money DIP Term Notes | Debtors | Maximum          
Debtor-in-Possession Financing          
DIP financing arranged     85.0    
Roll Up DIP Term Notes          
Debtor-in-Possession Financing          
DIP financing arranged     170.0    
Stated interest rate       10.00%  
Roll Up DIP Term Notes | Debtors          
Debtor-in-Possession Financing          
DIP financing arranged     170.0    
RA DIP ABL Facility          
Debtor-in-Possession Financing          
DIP financing arranged   $ 110.0 110.0    
RA DIP ABL Facility | Debtors | Maximum          
Debtor-in-Possession Financing          
DIP financing arranged     110.0    
Senior Secured Notes          
Debtor-in-Possession Financing          
Senior secured notes     $ 170.0   $ 305.0
Asset Purchase Agreement | Noteholder Group          
Bankruptcy proceedings          
Estimated total purchase consideration offered under the proposed asset purchase agreement $ 364.0        
Asset Purchase Agreement | Noteholder Group | Maximum          
Bankruptcy proceedings          
Estimated amount of liabilities to be assumed by the buyer $ 18.6        
Percentage of priority debtor claims that may be recovered as an upfront payment at closing in exchange for terms including negotiated credit limits, volume, and pricing 100.00%