Net Income Per Share - Schedule of Reconciliation of Basic and Diluted Share Counts (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 27, 2017	Sep. 28, 2016	Sep. 27, 2017	Sep. 28, 2016
Earnings Per Share [Abstract]
Weighted-average shares outstanding—basic (shares)	38,462,100	38,415,189	38,449,453	38,331,400
Dilutive effect of stock options and restricted shares (shares)	0	668,388	651,761	688,727
Weighted-average shares outstanding— diluted (shares)	38,462,100	39,083,577	39,101,214	39,020,127