Treasury Stock - Additional Information (Detail) (USD $)	1 Months Ended			9 Months Ended
	Feb. 09, 2012	May 25, 2011	Feb. 19, 2009	Sep. 28, 2012	Sep. 30, 2011
Equity, Class of Treasury Stock [Line Items]
Amount of common stock approved for repurchase	$ 35,000,000	$ 35,000,000	$ 25,100,000
Repurchase of common stock (in shares)				404,948	971,615
Repurchase of common stock				19,437,000	39,333,000
Remaining authorized amount for repurchase of common stock				24,969,000
Treasury stock reissued to settle restricted stock unit awards, stock options and purchases under Employee Stock Purchase Plan (in shares)				292,316	242,838
Treasury stock reissued to settle restricted stock unit awards, stock options and purchases under Employee Stock Purchase Plan				$ 7,902,000	$ 6,199,000