Income Taxes - Reconciliation of Uncertain Tax Positions Excluding Accrued Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Income Tax Disclosure [Abstract]
Gross uncertain tax positions at the beginning of the year	$ 2,286	$ 2,679	$ 2,633
Increase as a result of tax positions taken in the current period	571	966	687
Reduction as a result of the expiration of the applicable statute of limitations		(1,359)	(641)
Gross uncertain tax positions at the end of the year	$ 2,857	$ 2,286	$ 2,679