Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 240,321	$ 245,856	$ 485,938	$ 490,649
Americas (principally the U.S.)
Disaggregation Of Revenue [Line Items]
Total revenue	209,926	214,390	426,923	425,120
Europe, Middle East, and Africa
Disaggregation Of Revenue [Line Items]
Total revenue	22,134	22,606	43,166	47,232
Asia Pacific
Disaggregation Of Revenue [Line Items]
Total revenue	$ 8,261	$ 8,860	$ 15,849	$ 18,297