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Inventories - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Percentage of LIFO inventories on total inventories 23.00% 21.00%
Increase in income due to effect of liquidations $ 0.9  
Cost of Sales    
Inventory [Line Items]    
Increase in income due to effect of liquidations $ 1.4