Reconciliation of Basic and Diluted Net (loss) Income Per Share Computations and Number of Dilutive Equity Awards Included in Dilutive Net Income Per Share Computation (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2020	Sep. 29, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Oct. 01, 2019	Jul. 02, 2019	Apr. 02, 2019	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ (18,084)	$ (6,584)	$ (28,950)	$ (4,267)	$ 14,511	$ 3,671	$ 14,192	$ 12,864	$ (57,885)	$ 45,238	$ 50,810	$ 50,810
Weighted-average shares outstanding - basic									21,162	20,285	20,958	20,958
Dilutive effect of equity awards										307		626
Weighted-average shares outstanding - diluted									21,162	20,592	21,584	21,584