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Earnings Per Share - Potentially Dilutive Securities Excluded from Earnings Per Share Calculation (Detail)
3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Potentially dilutive shares 899,000 2,183,000 905,000 1,799,000