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Computation of Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 23, 2012
Sep. 30, 2012
Stock Options [Member]
   
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Restricted shares excluded from calculation of diluted earnings per share 22,500 17,750
Restricted Stock [Member]
   
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Restricted shares excluded from calculation of diluted earnings per share 0 3,496