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Earnings Per Share - Additional Information (Detail) (Stock Option Program and Stock Appreciation Right Program, AntiDilutive Due to Exercise Price Greater Than Market Price)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 23, 2012
Stock Option Program and Stock Appreciation Right Program | AntiDilutive Due to Exercise Price Greater Than Market Price
   
Earnings Per Share Disclosure [Line Items]    
Securities not included in the calculation of diluted earnings per share (in shares) 0.4 1.0