Deferred Revenue - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Total deferred revenue, current	$ 567,201		$ 603,944
Total deferred revenue, non-current	326,414		370,623
Total deferred revenue	893,615	$ 892,846	974,567	$ 935,407	$ 912,749	$ 934,828
Product, subscription and support
Revenue from External Customer [Line Items]
Total deferred revenue, current	478,235		508,580
Total deferred revenue, non-current	325,152		369,589
Professional services
Revenue from External Customer [Line Items]
Total deferred revenue, current	88,966		95,364
Total deferred revenue, non-current	$ 1,262		$ 1,034