Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining nine months)	$ 6,213
2018	8,284
2019	8,284
2020	3,934
2021	493
Total future amortization expense	27,208	$ 29,231
Cost of Sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining nine months)	3,885
2018	5,180
2019	5,180
2020	951
2021	0
Total future amortization expense	15,196
Operating Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining nine months)	2,328
2018	3,104
2019	3,104
2020	2,983
2021	493
Total future amortization expense	$ 12,012