Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 1,079,734	$ 1,058,951
Amortized intangible assets, accumulated amortization	(598,397)	(582,597)
Indefinite-lived intangible assets (excluding goodwill)	357
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	357	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	665,779	635,063
Amortized intangible assets, accumulated amortization	(349,705)	(332,622)
Customer Lists
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	258,239	269,629
Amortized intangible assets, accumulated amortization	(129,149)	(132,596)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	155,716	154,259
Amortized intangible assets, accumulated amortization	$ (119,543)	$ (117,379)