Net Income Per Share - Schedule of Reconciliation of Basic and Diluted Share Counts (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 28, 2017	Jun. 29, 2016	Jun. 28, 2017	Jun. 29, 2016
Earnings Per Share [Abstract]
Weighted-average shares outstanding—basic (shares)	38,449,240	38,294,575	38,443,130	38,289,505
Dilutive effect of stock options and restricted shares (shares)	674,721	668,227	659,371	692,105
Weighted-average shares outstanding— diluted (shares)	39,123,961	38,962,802	39,102,501	38,981,610