Earnings per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 20, 2017	Jun. 14, 2016	Jun. 20, 2017	Jun. 14, 2016
Numerator:
Net income	$ 5,330	$ 4,864	$ 9,568	$ 7,925
Denominator:
Weighted-average shares outstanding - basic (in shares)	38,535,855	38,292,215	38,769,895	38,545,115
Weighted-average shares outstanding - diluted	39,808,485	38,442,304	40,094,476	38,672,425
Net (loss) income per share - basic (in dollars per share)	$ 0.14	$ 0.13	$ 0.25	$ 0.21
Net (loss) income per share - diluted (in dollars per share)	$ 0.13	$ 0.13	$ 0.24	$ 0.20
Antidilutive stock options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in dollars per share)	36,500	12,720,918	36,500	12,800,021
Restricted Stock [Member]
Denominator:
Dilutive effect (in shares)	492,065	150,089	476,284	127,310
Stock Options [Member]
Denominator:
Dilutive effect (in shares)	23,550	0	23,226	0
Warrants [Member]
Denominator:
Dilutive effect (in shares)	757,015	0	825,071	0