Stockholders' Equity (Share Count And Par Value Data Related To Stockholders' Equity) (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jul. 02, 2011	Jan. 02, 2011
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	51,683,426	52,095,166	54,170,138	55,711,325
Treasury Stock, Shares held	20,468,431	20,056,691