Performance-Contingent Restricted Stock Activity (Detail) (Performance Contingent Restricted Stock, USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jul. 13, 2013
Performance Contingent Restricted Stock
Number of Shares
Outstanding unvested at beginning of period	888
Number of Shares, Initial grant	828
Number of Shares, Grant reduction for not achieving the S&P TSR	95
Number of Shares, Vested	(571)
Number of Shares, Forfeited	(9)
Outstanding unvested at end of period	1,231
Weighted Average Grant Date Fair Value
Weighted Average Fair Value, at beginning of period	$ 12.61
Weighted Average Grant Date Fair Value, Initial grant	$ 16.37
Weighted Average Grant Date Fair Value, Grant reduction for not achieving the S&P TSR	$ 10.62
Weighted Average Grant Date Fair Value, Vested	$ 10.62
Weighted Average Grant Date Fair Value, Forfeited	$ 15.75
Weighted Average Fair Value, Balance at end of period	$ 15.89