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Revenue - Net Sales and (Loss) Income from Continuing Operations before Income Taxes (Detail) (parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Impairment charge $ 0 $ 0 $ 10,082 $ 0
Akers National Roll Company [Member] | Avonmore, Pennsylvania [Member]        
Disaggregation Of Revenue [Line Items]        
Impairment charge     10,082  
Forged and Cast Engineered Products [Member]        
Disaggregation Of Revenue [Line Items]        
Bad debt expenses $ 1,366   $ 1,366