Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 210,343	$ 210,343
Accumulated Amortization	(204,715)	(199,744)
Total future amortization expense	5,628	10,599
Developed core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	136,145	136,145
Accumulated Amortization	(136,059)	(135,426)
Total future amortization expense	$ 86	719
Developed core technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	4 years
Developed core technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Customer relationships/contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 67,098	67,098
Accumulated Amortization	(62,434)	(58,784)
Total future amortization expense	$ 4,664	8,314
Customer relationships/contracts [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years
Customer relationships/contracts [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Maintenance agreements and related relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,100	7,100
Accumulated Amortization	(6,222)	(5,534)
Total future amortization expense	$ 878	$ 1,566
Maintenance agreements and related relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Maintenance agreements and related relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	7 years