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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 466,634	$ 228,097	$ 857,436	$ 574,970
United States
Disaggregation of Revenue [Line Items]
Revenue	387,662	208,045	733,038	515,403
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	32,218	4,904	62,416	18,658
Other
Disaggregation of Revenue [Line Items]
Revenue	46,754	15,148	61,982	40,909
Public Relations
Disaggregation of Revenue [Line Items]
Revenue	67,497	43,497	118,380	97,217
Creative
Disaggregation of Revenue [Line Items]
Revenue	125,637	1,927	127,791	6,792
Digital
Disaggregation of Revenue [Line Items]
Revenue	191,643	153,284	445,485	370,711
Experiential
Disaggregation of Revenue [Line Items]
Revenue	14,413	0	14,413	0
Media
Disaggregation of Revenue [Line Items]
Revenue	10,819	0	10,819	0
Research
Disaggregation of Revenue [Line Items]
Revenue	46,363	24,863	117,467	78,242
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 10,262	$ 4,526	$ 23,081	$ 22,008

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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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