Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 8,979	$ 7,698	$ 6,268
Additions based on tax positions related to the current year	2,539	4,580	2,106
Reductions for tax positions of prior years	(2,877)	(3,299)	(676)
Balance at end of year	$ 8,641	$ 8,979	$ 7,698