Stockholders' Equity - Roll Forward of Class A Common Shares Outstanding (Detail)	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Equity [Abstract]
Balance at the beginning of the year	50,349,546	50,908,267
Repurchases	0	(627,042)
Stock option and ESPP issuances	351,711	431,973
Restricted share issuances	117,140	238,325
Restricted share forfeitures	(5,258)	(5,008)
Shares withheld for tax obligations	(63,055)	(164,515)
Balance at the end of the period	50,750,084	50,782,000