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Going Concern (Detail)
9 Months Ended 12 Months Ended
Nov. 17, 2017
subsidiary
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 17, 2018
USD ($)
Jan. 08, 2015
USD ($)
Net loss   $ 58,000,000 $ 120,800,000 $ 102,600,000 $ 6,800,000    
Net cash used in operating activities   $ 20,600,000 12,900,000 $ (9,300,000) $ (93,200,000)    
Real Alloy              
Number of Real Alloy domestic subsidiaries included in bankruptcy filing | subsidiary 6            
Senior Secured Notes              
Senior secured notes           $ 170,000,000 $ 305,000,000
Debt instrument interest rate, stated percentage             10.00%
Senior Secured Notes | Real Alloy              
Senior secured notes     $ 305        
Debt instrument interest rate, stated percentage     10.00%