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Earnings Per Share - Potentially Dilutive Securities Excluded from Earnings Per Share Calculation (Detail)
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Earnings Per Share [Abstract]        
Potentially dilutive shares 0 351,000 179,760 879,000