Shareholders' Equity - Summary of Share Based Compensation Stock Options and Stock Units Activity (Detail) (USD $)	12 Months Ended
	Dec. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	393,500
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 8.49
Options Exercisable, Number Exercisable	390,000
Options Exercisable, Weighted Average Exercise Price	$ 8.43
$ 1.49 - 3.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	35,500
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 4 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 2.44
Options Exercisable, Number Exercisable	35,500
Options Exercisable, Weighted Average Exercise Price	$ 2.44
Range of Exercise Prices, Lower Limit	$ 1.49
Range of Exercise Prices, Upper Limit	$ 3.00
3.01 - 5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	142,000
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 11 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 4.25
Options Exercisable, Number Exercisable	142,000
Options Exercisable, Weighted Average Exercise Price	$ 4.25
Range of Exercise Prices, Lower Limit	$ 3.01
Range of Exercise Prices, Upper Limit	$ 5.00
5.01 - 12.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	20,000
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 9 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 7.78
Options Exercisable, Number Exercisable	20,000
Options Exercisable, Weighted Average Exercise Price	$ 7.78
Range of Exercise Prices, Lower Limit	$ 5.01
Range of Exercise Prices, Upper Limit	$ 12.00
12.01 - 15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	196,000
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years
Options Outstanding, Weighted Average Exercise Price	$ 12.81
Options Exercisable, Number Exercisable	192,500
Options Exercisable, Weighted Average Exercise Price	$ 12.81
Range of Exercise Prices, Lower Limit	$ 12.01
Range of Exercise Prices, Upper Limit	$ 15.00