Segment information - Revenue Classified by Major Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,394,035	$ 1,198,667	$ 1,033,379
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,336,628	1,146,759	998,344
Europe/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	51,698	45,767	31,599
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 5,709	$ 6,141	$ 3,436