Stockholders' Equity - Roll Forward of Class A Common Shares Outstanding (Detail)	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Equity [Abstract]
Balance at the beginning of the year	50,908,267	52,095,166
Repurchases	(627,042)	(673,863)
Stock option and ESPP issuances	431,973	98,315
Restricted share issuances	238,325	231,243
Restricted share forfeitures	(5,008)	(5,655)
Shares withheld for tax obligations	(164,515)	(61,780)
Balance at the end of the period	50,782,000	51,683,426