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Restricted Stock Awards (Detail) (Total share holder return, USD $)
12 Months Ended
Dec. 29, 2012
Grant Date February 10, 2011
Dec. 31, 2011
Grant Date February 9, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 324,000 268,000
Vesting date Feb. 10, 2013 Feb. 09, 2012
Fair value per share $ 15.93 $ 17.59