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Restructuring, Impairment and Integration Charges, excluding Goodwill Impairments, and Divestitures - Summary of Restructuring and Integration Charges (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Total $ 10,024 $ 7,268 $ 875
Charges 10,000 7,300  
Wheeling Plant [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance and other employee costs 5,776 2,019  
Site closure and other associated costs 3,970 4,399  
Integration and other associated costs 278 850  
Total 10,024 7,268  
Reserve beginning balance 4,362    
Charges 10,024 7,268  
Paid in (9,741) (254)  
Reserve ending balance 4,645 4,362  
Wheeling Plant [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Reserve beginning balance 2,517    
Charges 5,776 2,691  
Paid in (5,274) (174)  
Reserve ending balance 3,019 2,517  
Wheeling Plant [Member] | Site Closure and Other Associated Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Reserve beginning balance 1,845    
Charges 3,970 1,925  
Paid in (4,189) (80)  
Reserve ending balance 1,626 1,845  
Wheeling Plant [Member] | Integration and Other Associated Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Charges 278    
Paid in $ (278)    
Wheeling Plant [Member] | Impairment and Write-off Charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Charges   $ 2,652