Goodwill and Identified Intangible Assets - Amortization Expense for Identifiable Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Included in cost of revenue	$ 1,380	$ 86	$ 3,105	$ 633
Included in operating expenses	3,009	1,446	9,606	4,338
Total amortization expense	$ 4,389	$ 1,532	$ 12,711	$ 4,971