Goodwill and Intangible Assets, Net - Acquisition-Related Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,109,796	$ 487,656
Accumulated Amortization	(334,930)	(254,651)
Net Book Value	774,866	233,005
Developed Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	916,561	415,466
Accumulated Amortization	(298,096)	(228,008)
Net Book Value	618,465	187,458
Trademarks, Branding and Domain Names [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	184,845	63,800
Accumulated Amortization	(28,444)	(18,587)
Net Book Value	156,401	45,213
Noncompetition Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	8,390	8,390
Accumulated Amortization	$ (8,390)	(8,056)
Net Book Value		$ 334