Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Mar. 31, 2013 Reclassifications	Sep. 30, 2012 Reclassifications	Dec. 31, 2012 Reclassifications	Dec. 31, 2011 Reclassifications
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]
Contingent consideration payments	$ 16,367	$ 6,930	$ 7,200	$ 6,900	$ 17,600	$ 5,900