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Investment in Unconsolidated 50% or Less Owned Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2011 BHH [Member] | Sep. 30, 2010 BHH [Member] | Sep. 30, 2009 BHH [Member] | Dec. 31, 2011 Mincenco [Member]
Balance sheet [Abstract] |  |  |  |  |  |
Current assets |  |  | $ 54,327 | $ 48,970 |  |
Non-current assets | 40,922 | 37,570 | 49,040 | 51,571 |  |
Current liabilities |  |  | 36,318 | 45,108 |  |
Non-current liabilities |  |  | 4,696 | 4,420 |  |
Income statement [Abstract] |  |  |  |  |  |
Net sales |  |  | 105,845 | 89,430 | 63,321 |
Gross profit |  |  | 16,577 | 14,688 | 5,844 |
Income from continuing operations |  |  | $ 8,859 | $ 8,969 | $ (1,093) |
Joint venture ownership percentage (in hundredths) |  |  | 40.00% |  |  | 50.00%
Capacity of alumina refining facility in Jamaica (in metric ton) |  |  |  |  |  | 1.5 Million

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