Intangible Assets - Schedule of Amortizable Purchased Intangible Assets from Acquisition (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross	$ 59,380	$ 42,520
Accumulated Amortization	(13,055)	(11,647)
Accumulated Impairment	(29,749)	(29,749)
Net	16,576	1,124
Total purchased intangible assets, net	18,596
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross	29,660	26,000
Accumulated Amortization	(6,765)	(6,453)
Accumulated Impairment	(19,547)	(19,547)
Net	3,348	0
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross	17,500	12,800
Accumulated Amortization	(3,812)	(3,183)
Accumulated Impairment	(8,582)	(8,582)
Net	5,106	1,035
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	10,600
Accumulated Amortization	(858)
Accumulated Impairment	(1,620)
Net	8,122
Other
Finite-Lived Intangible Assets [Line Items]
Gross	1,620	3,720
Accumulated Amortization	(1,620)	(2,011)
Accumulated Impairment	0	(1,620)
Net	0	$ 89
Other
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets:	$ 2,020