Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 45,687	$ 221,704
Accumulated Amortization	(41,590)	(211,105)
Total	4,097	10,599
Developed core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,987	136,145
Accumulated Amortization	(10,987)	(135,426)
Total	$ 0	719
Developed core technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Developed core technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Customer relationships/contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 29,200	67,098
Accumulated Amortization	(25,752)	(58,784)
Total	$ 3,448	8,314
Customer relationships/contracts [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Customer relationships/contracts [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 0	11,361
Accumulated Amortization	0	(11,361)
Total	$ 0	0
Trademarks and tradenames [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Trademarks and tradenames [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Maintenance agreements and related relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,500	7,100
Accumulated Amortization	(4,851)	(5,534)
Total	$ 649	$ 1,566
Maintenance agreements and related relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Maintenance agreements and related relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years