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Net Income Per Common Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Restricted Stock Units (RSUs) [Member]        
Net Income Loss Per Common Share        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.2 0.6 0.4 0.5