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Revenue from Contracts with Customer - Schedule of Revenue Disaggregation by Location (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 581,977 $ 533,732 $ 736,654 $ 691,710
Americas        
Disaggregation of Revenue [Line Items]        
Total revenues 287,942 259,216 356,331 328,749
United States        
Disaggregation of Revenue [Line Items]        
Total revenues 251,194 222,769 306,493 277,706
EMEA        
Disaggregation of Revenue [Line Items]        
Total revenues 184,913 171,604 236,602 231,486
United Kingdom        
Disaggregation of Revenue [Line Items]        
Total revenues 46,355 41,443 57,321 59,086
Asia-Pacific ("APAC")        
Disaggregation of Revenue [Line Items]        
Total revenues $ 109,122 $ 102,912 $ 143,721 $ 131,475