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Inventories - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2009
Schedule of Inventory [Line Items]    
Increase/Decrease in earnings, net of income taxes related to reductions in quantities of LIFO inventories valued at costs prevailing in prior years $ 10.6 $ 1.0