Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 507,836	$ 498,231
Accumulated Amortization	(375,008)	(367,531)
Foreign Currency Translation Adjustment	(7,348)	(5,218)
Net Carrying Amount	125,480	125,482
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	361,787	336,308
Accumulated Amortization	(279,000)	(252,080)
Foreign Currency Translation Adjustment	(5,709)	(4,079)
Net Carrying Amount	77,078	80,149
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	75,669	97,153
Accumulated Amortization	(59,077)	(83,448)
Foreign Currency Translation Adjustment	(455)	(340)
Net Carrying Amount	16,137	13,365
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	70,120	64,420
Accumulated Amortization	(36,671)	(31,653)
Foreign Currency Translation Adjustment	(1,184)	(799)
Net Carrying Amount	32,265	31,968
Non-compete Agreements
Finite-Lived Intangible Assets
Gross Carrying Amount		320
Accumulated Amortization		(320)
Backlog
Finite-Lived Intangible Assets
Gross Carrying Amount	260	30
Accumulated Amortization	$ (260)	$ (30)