Stockholders' Equity - Roll Forward of Class A Common Shares Outstanding (Detail)	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Balance at the beginning of the year	50,908,267	52,095,166
Repurchases	(87,254)	(264,567)
Stock option and ESPP issuances	199,715	76,063
Restricted share issuances	3,698	3,635
Restricted share forfeitures	(708)	(1,923)
Shares withheld for tax obligations	(5,851)	0
Balance at the end of the period	51,017,867	51,908,374