Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
2014	$ 20,520
2015	6,502
2016	4,097
2017	0
2018	0
Total	31,119	58,447
Cost of revenue [Member]
Finite-Lived Intangible Assets [Line Items]
2014	13,745
2015	719
2016	0
2017	0
2018	0
Total	14,464
Operating Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
2014	6,775
2015	5,783
2016	4,097
2017	0
2018	0
Total	$ 16,655