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Cash Proceeds and Intrinsic Value Related to Total Stock Options Exercised (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Proceeds from stock options exercised $ 0.3 $ 2.6
Intrinsic value of stock options exercised $ 0.3 $ 5.9