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Marketable securities - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Snake River [Member]
Dec. 31, 2012
TIMET [Member]
Dec. 31, 2011
TIMET [Member]
Dec. 31, 2012
Amalgamated Sugar Company LLC [Member]
Dec. 31, 2012
Amalgamated Sugar Company LLC [Member]
Snake River [Member]
Dec. 31, 2012
Amalgamated Sugar Company LLC [Member]
Base Level [Member]
Schedule of Available-for-sale Securities [Line Items]            
Net of assets transferred to the LLC       $ 34    
Fair value on investment in the LLC redemption price       250    
Loan issued by Snake River 250          
Cost of the investment in LLC       250    
Dividend from LLC with a base level           26.7
Percentage of share from profit of LLC       95.00%    
Additional preferential share receivable in case distributions are below this base level       95.00%    
Interest payable towards loan         1.8  
Investment in common stock     6.5      
Percentage of outstanding common stock held     3.70%      
Common stock quoted market price per share     $ 14.98      
Sale of common stock   107.6        
Sale of common stock, price per share   $ 16.50        
Pre-tax gain on sale of shares   $ 21.6