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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,469,363	$ 888,032
United States
Disaggregation of Revenue [Line Items]
Revenue	1,219,816	804,418
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	105,961	41,489
Other
Disaggregation of Revenue [Line Items]
Revenue	143,586	42,125
Digital Transformation
Disaggregation of Revenue [Line Items]
Revenue	400,857	374,689
Creativity and Communications
Disaggregation of Revenue [Line Items]
Revenue	561,538	152,499
Performance Media and Data
Disaggregation of Revenue [Line Items]
Revenue	341,730	253,011
Consumer Insights and Strategy
Disaggregation of Revenue [Line Items]
Revenue	$ 165,238	$ 107,833

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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