Earnings per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 28, 2017	Mar. 22, 2016
Numerator:
Net income	$ 4,238	$ 3,061
Denominator:
Weighted-average shares outstanding - basic (in shares)	39,003,935	38,798,014
Weighted-average shares outstanding - diluted	40,375,061	38,798,301
Net (loss) income per share - basic (in dollars per share)	$ 0.11	$ 0.08
Net (loss) income per share - diluted (in dollars per share)	$ 0.10	$ 0.08
Antidilutive stock options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in dollars per share)	36,500	1,924,162
Restricted Stock and RSUs [Member]
Denominator:
Dilutive effect (in shares)	454,810	287
Stock Options [Member]
Denominator:
Dilutive effect (in shares)	23,190	0
Warrants [Member]
Denominator:
Dilutive effect (in shares)	893,126	0