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Earnings Per Share - Potentially Dilutive Securities Excluded from Earnings Per Share Calculation (Detail)
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Earnings Per Share [Abstract]        
Potentially dilutive shares 351,000 2,150,000 879,000 1,809,000