Stockholders' Equity (Roll Forward Of Class A Common Shares Outstanding) (Detail)	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Balance at the beginning of the year	52,095,166	55,711,325
Repurchases	(673,863)	(2,100,000)
Stock option and ESPP issuances	98,315	409,550
Restricted share issuances	231,243	209,168
Restricted share forfeitures	(5,655)	(8,445)
Shares withheld for tax obligations	(61,780)	(51,460)
Balance at the end of the period	51,683,426	54,170,138