Share-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period, years			3 years
Share-based compensation expense	$ 1,089,000	$ 676,000	$ 3,022,000	$ 2,070,000
Weighted-average grant-date fair value			$ 22.51	$ 14.15
Total intrinsic value of stock options exercised	500,000	1,400,000	7,100,000	8,400,000
Total fair value of stock options vested	0	0	1,800,000	1,600,000
Unrecognized stock-based compensation expense	$ 7,500,000		$ 7,500,000
Expected recognition period (years)			2 years