Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at beginning of year	$ 1,345	$ 1,532	$ 1,516
Increases for tax positions taken in prior years	190	10	69
Decreases for tax positions taken in prior years	(291)	(5)	(49)
Increases for tax positions taken in the current year	89	130	87
Lapse in statute of limitations		(322)	(91)
Gross unrecognized tax benefits at end of year	$ 1,333	$ 1,345	$ 1,532