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Performance Contingent Restricted Stock Awards (Detail) (Grant Date February 10, 2011, Restricted Stock Awards, USD $)
9 Months Ended
Oct. 06, 2012
Grant Date February 10, 2011 | Restricted Stock Awards
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted 324,000
Approximate vesting date Feb. 10, 2013
Fair value per share $ 15.93