Earnings per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 10, 2019	Jun. 18, 2019	Mar. 26, 2019	Sep. 11, 2018	Jun. 19, 2018	Mar. 27, 2018	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Numerator:
Net (loss) income	$ (7,669)	$ 2,092	$ 1,425	$ 5,874	$ 4,210	$ 3,229	$ (114,133)	$ 5,646	$ (118,285)	$ 18,959	$ 49,871
Denominator:
Weighted-average shares outstanding - basic (in shares)									37,018,445	38,106,057	38,689,508
Weighted-average shares outstanding - diluted (in shares)									37,018,445	38,683,959	39,949,907
Net (loss) income per share - basic (in dollars per share)	$ (0.21)	$ 0.06	$ 0.04	$ 0.15	$ 0.11	$ 0.08	$ (3.08)	$ 0.15	$ (3.20)	$ 0.50	$ 1.29
Net (loss) income per share - diluted (in dollars per share)	$ (0.21)	$ 0.06	$ 0.04	$ 0.15	$ 0.11	$ 0.08	$ (3.08)	$ 0.15	$ (3.20)	$ 0.49	$ 1.25
Antidilutive options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in shares)									6,661,450	686,278	69,722
Dilutive effect of restricted shares
Denominator:
Dilutive effect (in shares)									0	256,217	417,371
Dilutive effect of stock options
Denominator:
Dilutive effect (in shares)									0	17,611	28,931
Dilutive effect of warrants
Denominator:
Dilutive effect (in shares)									0	304,074	814,097