Goodwill and Identified Intangible Assets - Amortization Expense for Identifiable Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 5,512	$ 6,764	$ 18,378	$ 20,569
Included in cost of revenue [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	3,851	4,763	13,049	14,470
Included in operating expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 1,661	$ 2,001	$ 5,329	$ 6,099