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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Marketable securities $ 255.7 $ 253.5
Amalgamated Sugar Company LLC    
Schedule Of Available For Sale Securities [Line Items]    
Net of assets transferred to the LLC 34.0  
Marketable securities 250.0  
Cost of the investment in LLC $ 250.0  
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 250.0  
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