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Litigation and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 15, 2013
Jun. 16, 2012
Jun. 15, 2013
Jun. 16, 2012
Commitments And Contingencies Disclosure [Abstract]        
Incurred royalty expense $ 0.4 $ 0.4 $ 0.8 $ 0.9
Incurred advertising expense $ 1.0 $ 0.8 $ 2.1 $ 1.7