Revenue from Contracts with Customers - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) division	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) division	Jun. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 852,824	$ 794,715	$ 1,695,532	$ 1,559,017
Number of groups | division	2		2
Security Technology Group
Disaggregation of Revenue [Line Items]
Revenue	$ 325,128	259,316	$ 635,347	499,616
Edge Technology Group
Disaggregation of Revenue [Line Items]
Revenue	527,696	535,399	1,060,185	1,059,401
U.S.
Disaggregation of Revenue [Line Items]
Revenue	449,553	443,668	912,733	872,598
International
Disaggregation of Revenue [Line Items]
Revenue	$ 403,271	$ 351,047	$ 782,799	$ 686,419