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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Segments [Abstract]                      
Number of reportable business segment 1               1    
Reconciliation of consolidated assets to total primary aluminum segment [Abstract]                      
Segment assets $ 1,811,094 [1]       $ 1,923,056 [1]       $ 1,811,094 [1] $ 1,923,056 [1] $ 1,861,750 [1]
Geographic information [Abstract]                      
Net sales 318,164 [2] 345,646 [3] 366,277 [4] 326,337 [5] 316,851 [6] 279,178 [7] 287,853 [8] 285,389 1,356,424 1,169,271 899,253
Number of major customers whose sales revenue exceeded ten percent of net sales                 3 3 3
Percentage of sales to a single customer that will constitutes a major customer (in hundredths)                 10.00% 10.00% 10.00%
Glencore [Member]
                      
Major customer information [Abstract]                      
Sales revenue                 564,431 413,408 230,909
Southwire [Member]
                      
Major customer information [Abstract]                      
Sales revenue                 373,505 323,873 234,535
BHP Billiton [Member]
                      
Major customer information [Abstract]                      
Sales revenue                 239,157 214,571 166,546
United States [Member]
                      
Geographic information [Abstract]                      
Net sales                 835,796 714,409 565,999
Long-lived assets 401,173 [9]       412,266 [9]       401,173 [9] 412,266 [9] 436,798 [9]
Iceland [Member]
                      
Geographic information [Abstract]                      
Net sales                 520,628 453,021 332,927
Long-lived assets 884,682 [9]       894,297 [9]       884,682 [9] 894,297 [9] 899,855 [9]
Others [Member]
                      
Geographic information [Abstract]                      
Net sales                 0 1,841 327
Long-lived assets 36,919 [9]       39,415 [9]       36,919 [9] 39,415 [9] 35,629 [9]
Primary [Member]
                      
Reconciliation of consolidated assets to total primary aluminum segment [Abstract]                      
Segment assets 1,767,305 [1]       1,895,430 [1]       1,767,305 [1] 1,895,430 [1] 1,815,589 [1]
Corporate Unallocated [Member]
                      
Reconciliation of consolidated assets to total primary aluminum segment [Abstract]                      
Segment assets $ 43,789 [1]       $ 27,626 [1]       $ 43,789 [1] $ 27,626 [1] $ 46,161 [1]
[1] Segment assets include cash and cash equivalents, accounts receivable, due from affiliates, prepaid and other current assets, inventory, intangible assets and property, plant and equipment-net; the remaining assets are unallocated corporate assets.
[2] The fourth quarter of 2011 net loss includes benefit of $3,067 for mark-to-market gains primarily related to primary aluminum price protection options and a $6,303 charge for lower of cost or market inventory adjustments.
[3] The third quarter of 2011 net loss includes a benefit of $4,163 for mark-to-market gains primarily related to primary aluminum price protection options and a $13,479 charge for lower of cost or market inventory adjustments.
[4] The second quarter of 2011 net income includes a benefit of $8,953 for changes to the Century of West Virginia retiree medical benefits program, a $7,707 charge related to the contractual impact of recent changes in the composition of our Board of Directors and executive management team and a $2,889 charge related to an insurance claim receivable.
[5] The first quarter of 2011 net income includes a charge of $4,809 for mark-to-market losses primarily related to primary aluminum price protection options, a benefit of $9,418 for changes to the Century of West Virginia retiree medical benefits program and a $6,462 charge for the restart of the curtailed potline at Hawesville.
[6] The fourth quarter of 2010 net income includes a benefit of $56,728 for changes to the Century of West Virginia retiree medical benefits program, a charge of $5,681 for mark-to-market losses for primary aluminum price protection options and a charge for contractual termination pension benefits of $4,555 due to the continued curtailment of the Ravenswood facility.
[7] The third quarter of 2010 net loss includes a charge of $12,136 for mark-to-market losses primarily related to primary aluminum price protection options and a $7,300 benefit for lower of cost or market inventory adjustments.
[8] The second quarter of 2010 net income includes a charge of $9,294 for mark-to-market losses primarily related to primary aluminum price protection options and a $7,056 charge for lower of cost or market inventory adjustments.
[9] Includes long-lived assets other than financial instruments