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Business acquisitions - SomethingDigital.Com LLC - Narrative (Details) $ in Thousands		9 Months Ended
	Oct. 05, 2020 USD ($) numberOfOperatingSegment	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired		$ 6,613	$ 0
Goodwill		1,685,684		$ 1,695,688	$ 1,574,466
Goodwill deductible for tax purposes		$ 277,428		$ 296,046
SomethingDigital.Com LLC
Business Acquisition [Line Items]
Ownership percentage acquired (in percentage)	100.00%
Purchase consideration	$ 57,451
Payment for business acquisitions, net of cash acquired	56,073
Cash and cash equivalents	1,378
Cash consideration to acquired certain assets and assumed certain liabilities	57,704
Consideration receivable	$ 253
Acquired intangible assets, weighted average amortization period	4 years
Goodwill	$ 36,926
Number of Reportable Segments | numberOfOperatingSegment	2
Goodwill deductible for tax purposes	$ 35,084
Acquisition related cost	1,060
Acquired assets	9,538
Liabilities assumed	4,494
Net deferred tax assets	81
SomethingDigital.Com LLC | CGRLH
Business Acquisition [Line Items]
Goodwill	30,373
SomethingDigital.Com LLC | HMS
Business Acquisition [Line Items]
Goodwill	6,553
SomethingDigital.Com LLC | Customer-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles	11,900
SomethingDigital.Com LLC | Marketing-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles	$ 3,500

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