Stockholders' Equity - Roll Forward of Class A Common Shares Outstanding (Detail)	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Equity [Abstract]
Balance at the beginning of the year	50,349,546	50,908,267
Repurchases	0	(1,268,761)
Stock option and ESPP issuances	511,163	532,777
Restricted share issuances	125,626	238,325
Restricted share forfeitures	(6,733)	(15,973)
Shares withheld for tax obligations	(65,241)	(165,059)
Balance at the end of the period	50,914,361	50,229,576