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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 498,231	$ 414,038
Accumulated Amortization	(367,531)	(337,155)
Foreign Currency Translation Adjustment	(5,218)	2,205
Net Carrying Amount	125,482	79,088
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	336,308	270,877
Accumulated Amortization	(252,080)	(226,190)
Foreign Currency Translation Adjustment	(4,079)	1,618
Net Carrying Amount	80,149	46,305
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	97,153	92,741
Accumulated Amortization	(83,448)	(83,585)
Foreign Currency Translation Adjustment	(340)	171
Net Carrying Amount	13,365	9,327
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	64,420	50,100
Accumulated Amortization	(31,653)	(27,120)
Foreign Currency Translation Adjustment	(799)	416
Net Carrying Amount	31,968	23,396
Non-compete Agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	320	320
Accumulated Amortization	(320)	(260)
Net Carrying Amount		$ 60
Backlog [Member]
Finite-Lived Intangible Assets
Gross Carrying Amount	30
Accumulated Amortization	$ (30)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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