Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 173,981	$ 197,796	$ 196,187	$ 183,512	$ 169,809	$ 177,953	$ 162,261	$ 154,443	$ 751,476	$ 664,466	$ 570,420
Income from operations	28,611	38,476	36,700	36,947	31,607	35,670	30,754	29,908	140,734	127,939	104,231
Net income	$ 18,656	$ 24,536	$ 23,244	$ 23,551	$ 20,619	$ 22,887	$ 19,342	$ 19,072	$ 89,987	$ 81,920	$ 70,962
Diluted earnings per share	$ 0.52	$ 0.68	$ 0.64	$ 0.64	$ 0.56	$ 0.62	$ 0.53	$ 0.52	$ 2.49	$ 2.24	$ 1.94