Deferred Stock Activity (Detail) - Deferred stock $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Oct. 06, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at beginning of period | shares	87
Shares, Vested | shares	(87)
Shares, Granted | shares	78
Shares, Balance at end of period | shares	78
Weighted Average Fair Value, Balance at beginning of period | $ / shares	$ 18.70
Weighted Average Fair Value, Vested | $ / shares	18.57
Weighted Average Fair Value, Granted | $ / shares	19.89
Weighted Average Fair Value, Balance at end of period | $ / shares	$ 19.89
Weighted Average Remaining Contractual Term (Years)	7 months 13 days
Aggregate Intrinsic Value | $	$ 1,756