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Marketable Securities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Amalgamated Sugar Company LLC
 
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
Cost of the investment in LLC 250
Percentage of share from profit of LLC 95.00%
Additional preferential share receivable in case distributions are below this base level 95.00%
Amalgamated Sugar Company LLC | Base Level
 
Schedule Of Available For Sale Securities [Line Items]  
Distributions from LLC - aggregate annual base level 26.7
Snake River
 
Schedule Of Available For Sale Securities [Line Items]  
Loan issued by Snake River 250
Snake River | Amalgamated Sugar Company LLC
 
Schedule Of Available For Sale Securities [Line Items]  
Minimum amount annual distributions received from Amalgamated Sugar LLC will exceed Snake River loan interest payments $ 1.8