Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 85,175	$ 45,687
Accumulated Amortization	(55,944)	(41,590)
Total future amortization expense	$ 29,231	4,097
Developed core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 2 months 12 days
Gross Carrying Amount	$ 31,707	10,987
Accumulated Amortization	(15,216)	(10,987)
Total future amortization expense	$ 16,491	0
Customer relationships/contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years 2 months 12 days
Gross Carrying Amount	$ 44,384	29,200
Accumulated Amortization	(32,098)	(25,752)
Total future amortization expense	$ 12,286	3,448
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 2 months 12 days
Gross Carrying Amount	$ 573	0
Accumulated Amortization	(119)	0
Total future amortization expense	454	0
Maintenance agreements and related relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,500	5,500
Accumulated Amortization	(5,500)	(4,851)
Total future amortization expense	0	$ 649
Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,011
Accumulated Amortization	(3,011)
Total future amortization expense	$ 0