Earnings Per Share - Schedule of Computation of Basic Earnings per Share and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Numerator:
Net income	$ 34,599	$ 34,017	$ 34,339	$ 30,647	$ 21,967	$ 27,008	$ 28,437	$ 29,187	$ 133,602	$ 106,599	$ 106,049
Denominator:
Weighted average basic shares outstanding									33,097	33,964	34,516
Effect of compensation awards									110	88	82
Weighted average diluted shares outstanding									33,207	34,052	34,598
Earnings Per Share:
Basic									$ 4.04	$ 3.14	$ 3.07
Diluted	$ 1.05	$ 1.03	$ 1.03	$ 0.93	$ 0.65	$ 0.80	$ 0.83	$ 0.85	$ 4.02	$ 3.13	$ 3.07