Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 03, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
2015 (remaining 6 months)	$ 3,064
2016	4,096
Total future amortization expense	7,160	$ 10,599
Product cost of revenue [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2015 (remaining 6 months)	172
2016	0
Total future amortization expense	172
Operating Expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2015 (remaining 6 months)	2,892
2016	4,096
Total future amortization expense	$ 6,988