Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 26, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
2014 (remaining 3 months)	$ 2,141
2015	6,502
2016	4,097
Total future amortization expense	12,740	31,119
Product cost of revenue [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2014 (remaining 3 months)	695
2015	719
2016	0
Total future amortization expense	1,414
Operating Expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2014 (remaining 3 months)	1,446
2015	5,783
2016	4,097
Total future amortization expense	$ 11,326