Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 1,058,951	$ 756,936
Amortized intangible assets, accumulated amortization	(582,597)	(546,021)
Indefinite-lived trade name	357
Trade Names
Intangible Assets [Line Items]
Indefinite-lived trade name	357	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	635,063	410,680
Amortized intangible assets, accumulated amortization	(332,622)	(314,730)
Customer Lists
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	269,629	209,031
Amortized intangible assets, accumulated amortization	(132,596)	(117,614)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	154,259	137,225
Amortized intangible assets, accumulated amortization	$ (117,379)	$ (113,677)