Breakdown of Revenue and Non-Current Assets by Geographical Areas - Revenue by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 470,345	$ 522,606	$ 1,411,335	$ 1,608,876
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	204,618	213,937	582,037	645,904
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	167,800	185,556	517,535	589,558
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 97,927	$ 123,113	$ 311,763	$ 373,414