Stockholders' Equity (Share Count And Par Value Data Related To Stockholders' Equity) (Detail) (USD $)	Sep. 29, 2012	Dec. 31, 2011	Oct. 01, 2011	Dec. 31, 2010
Stockholders Equity [Line Items]
Preferred Stock, Par value per share	$ 0.01	$ 0.01
Preferred Stock, Shares authorized	10,000,000	10,000,000
Preferred Stock, Shares outstanding	0	0
Common Stock-Class A, Par value per share	$ 0.01	$ 0.01
Common Stock-Class A, Shares authorized	150,000,000	150,000,000
Common Stock-Class A, Shares issued	72,151,857	72,151,857
Common Stock-Class A, Shares outstanding	51,252,384	52,095,166	52,388,510	55,711,325
Treasury stock, Shares held	20,899,473	20,056,691