Stock Appreciation Rights Activity (Detail) (Stock Appreciation Rights, USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jul. 13, 2013
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding unvested at beginning of period	195
Number of Rights, Rights exercised	(32)
Outstanding unvested at end of period	163
Weighted Average Fair Value outstanding, at beginning of period	$ 7.01
Weighted Average Fair Value, Rights Exercised	$ 6.52
Weighted Average Fair Value outstanding, at end of period	$ 7.11
Weighted Average Remaining Contractual Term (Years), Outstanding at end of period	1 year 9 months 26 days
Aggregate Intrinsic Value, Balance at end of period	$ 2,702