Stockholders' Equity - Roll Forward of Class A Common Shares Outstanding (Detail)	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Equity [Abstract]
Balance at the beginning of the year	50,908,267	52,095,166
Repurchases	(1,268,761)	(1,073,863)
Stock option and ESPP issuances	532,777	176,274
Restricted share issuances	238,325	236,576
Restricted share forfeitures	(15,973)	(113,640)
Shares withheld for tax obligations	(165,059)	(68,129)
Balance at the end of the period	50,229,576	51,252,384