Income Taxes - Reconciliation of Uncertain Tax Positions Excluding Accrued Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Income Tax Disclosure [Abstract]
Gross uncertain tax positions at the beginning of the year	$ 2,679	$ 2,633	$ 2,620
Increase as a result of tax positions taken in the current period	966	687	547
Reduction as a result of the expiration of the applicable statute of limitations	(1,359)	(641)	(534)
Gross uncertain tax positions at the end of the year	$ 2,286	$ 2,679	$ 2,633