Deferred Stock Activity (Detail) (Deferred Stock Activity, USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Oct. 06, 2012 Y
Deferred Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Balance at beginning of period	231,000
Number of shares, Deferred stock issued	66,000
Number of shares, Deferred stock exercised	(45,000)
Number of shares, at end of period	252,000
Outstanding vested at end of period	160,000
Outstanding unvested at end of period	92,000
Shares vesting at end of period	77,000
Weighted Average Fair Value, at beginning of period	$ 16.43
Weighted Average Fair Value, Deferred stock issued	$ 20.62
Weighted Average Fair Value, Deferred stock exercised	$ 18.00
Weighted Average Fair Value, Balance at end of period	$ 17.24
Outstanding vested at end of period	$ 15.98
Outstanding unvested Weighted Average Fair Value, at end of period	$ 19.45
Shares vesting Weighted Average Fair Value, at end of period	$ 18.62
Outstanding vested at end of period, Weighted Average Remaining Contractual Term (Years)	0.24
Outstanding unvested at end of period, Weighted Average Remaining Contractual Term (Years)	0.67
Aggregate Intrinsic Value, Balance at end of period	$ 4,827
Outstanding vested at end of period, Aggregate Intrinsic Value	3,071
Outstanding unvested at end of period, Aggregate Intrinsic Value	1,755
Shares vesting at end of period, Aggregate Intrinsic Value	$ 1,483