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Business acquisitions - Acquisition of Mt. Holly smelter table (Details) - Mt. Holly Smelter [Member]
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 10 Months Ended
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
Dec. 01, 2014
USD ($)
Agreement
Assets Acquired:        
Inventories       $ 23,979
Due from Alumax       11,269
Prepaid and other current assets       2,527
Intangible asset       2,580
Pension asset       30,842
Property, plant and equipment – net       142,837
Total assets acquired       214,034
Liabilities Assumed:        
Accounts payable, trade       41,471
Accrued and other current liabilities       8,590
Accrued pension benefit costs       34,595
Accrued postretirement benefit costs       2,857
Asset retirement obligations       8,213
Deferred taxes       2,686
Total liabilities assumed       98,412
Goodwill       0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Inventories     $ (2,126)  
Due from Alumax     (9,517)  
Property, plant and equipment – net     15,748  
Total assets acquired     4,105  
Accrued and other current liabilities     255  
Accrued pension benefit costs     34,595  
Deferred taxes     (2,118)  
Total liabilities assumed     32,732  
Goodwill     $ (4,804)  
Pro forma information        
Pro forma revenues $ 573,230 $ 1,575,842    
Pro forma earnings from continuing operations $ 58,050 $ 53,824    
Pro forma earnings (loss) per common share, basic (in dollars per share) | $ / shares $ 0.60 $ 0.56    
Pro forma earnings (loss) per common share, diluted (in dollars per share) | $ / shares $ 0.60 $ 0.55    
Due from Alumax, purchase price credit       11,269
Alumina Supply Agreements       $ 14,880
Number of alumina supply agreements | Agreement       2
Preliminary estimate [Member]        
Assets Acquired:        
Inventories       $ 26,105
Due from Alumax       20,786
Prepaid and other current assets       2,527
Intangible asset       2,580
Pension asset       30,842
Property, plant and equipment – net       127,089
Total assets acquired       209,929
Liabilities Assumed:        
Accounts payable, trade       41,471
Accrued and other current liabilities       8,335
Accrued pension benefit costs       0
Accrued postretirement benefit costs       2,857
Asset retirement obligations       8,213
Deferred taxes       4,804
Total liabilities assumed       65,680
Goodwill       $ 4,804