Summary of Stock Options Outstanding (Detail) (USD $)	3 Months Ended
	Mar. 30, 2013
$2.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 2.50
Options Outstanding	11,171
Options Outstanding, Weighted Average Contractual Life (Years)	0 years
Options Outstanding, Weighted Average Exercise Price	$ 2.50
Options Exercisable	11,171
Options Exercisable, Weighted Average Exercise Price	$ 2.50
$4.00 - $9.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 4.00
Maximum Exercise Price	$ 9.99
Options Outstanding	2,660,848
Options Outstanding, Weighted Average Contractual Life (Years)	5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 5.52
Options Exercisable	1,132,394
Options Exercisable, Weighted Average Exercise Price	$ 5.14
$10.00 - $15.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 10.00
Maximum Exercise Price	$ 15.99
Options Outstanding	656,690
Options Outstanding, Weighted Average Contractual Life (Years)	4 years
Options Outstanding, Weighted Average Exercise Price	$ 14.04
Options Exercisable	607,344
Options Exercisable, Weighted Average Exercise Price	$ 14.34
$16.00 - $17.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 16.00
Maximum Exercise Price	$ 17.00
Options Outstanding	679,840
Options Outstanding, Weighted Average Contractual Life (Years)	4 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 16.86
Options Exercisable	464,819
Options Exercisable, Weighted Average Exercise Price	$ 16.86
$18.00 - $19.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 18.00
Maximum Exercise Price	$ 19.00
Options Outstanding	975,000
Options Outstanding, Weighted Average Contractual Life (Years)	4 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 18.15
Options Exercisable	650,000
Options Exercisable, Weighted Average Exercise Price	$ 18.15
$24.00 - $37.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 24.00
Maximum Exercise Price	$ 37.00
Options Outstanding	16,000
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 30.37
Options Exercisable	16,000
Options Exercisable, Weighted Average Exercise Price	$ 30.37