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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	$ 503,731	$ 498,231
Accumulated Amortization		(378,164)	(367,531)
Foreign Currency Translation Adjustment		(6,195)	(5,218)
Net Carrying Amount		119,372	125,482
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	337,218	336,308
Accumulated Amortization		(259,129)	(252,080)
Foreign Currency Translation Adjustment		(4,812)	(4,079)
Net Carrying Amount		73,277	80,149
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	100,743	97,153
Accumulated Amortization		(85,469)	(83,448)
Foreign Currency Translation Adjustment		(408)	(340)
Net Carrying Amount		14,866	13,365
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	64,670	64,420
Accumulated Amortization		(32,897)	(31,653)
Foreign Currency Translation Adjustment		(973)	(799)
Net Carrying Amount		30,800	31,968
Non-compete Agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	320	320
Accumulated Amortization			(320)
Backlog
Finite-Lived Intangible Assets
Gross Carrying Amount	[1]	780	30
Accumulated Amortization		(349)	$ (30)
Foreign Currency Translation Adjustment		(2)
Net Carrying Amount		$ 429
[1] Includes $5.5 million of intangible assets from Lemsys acquisition.

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