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. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Numerator:
Net income	$ 28,701	$ 26,695	$ 25,982	$ 24,671	$ 21,787	$ 26,060	$ 23,143	$ 21,339	$ 106,049	$ 92,329	$ 89,987
Denominator:
Weighted average basic shares outstanding									34,516	35,466	36,052
Effect of compensation awards									82	72	138
Weighted average diluted shares outstanding									34,598	35,538	36,190
Earnings Per Share:
Basic									$ 3.07	$ 2.60	$ 2.50
Diluted	$ 0.83	$ 0.77	$ 0.75	$ 0.71	$ 0.62	$ 0.73	$ 0.65	$ 0.60	$ 3.07	$ 2.60	$ 2.49