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Business acquisitions - SomethingDigital.Com LLC - Narrative (Details) $ in Thousands		12 Months Ended
	Oct. 05, 2020 USD ($) numberOfOperatingSegment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired		$ 72,025	$ 186,633	$ 252,276
Goodwill		1,731,027	1,695,688	1,574,466
Goodwill deductible for tax purposes		326,795	296,046
Acquisition related cost		$ 1,177	$ 2,650	$ 8,352
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
Hoodoo Digital, LLC
Business Acquisition [Line Items]
Ownership percentage acquired (in percentage)		100.00%
Purchase consideration		$ 66,592
Payment for business acquisitions, net of cash acquired		64,310
Cash and cash equivalents		2,283
Cash consideration to acquired certain assets and assumed certain liabilities		67,695
Consideration receivable		$ 1,102
Acquired intangible assets, weighted average amortization period		5 years
Goodwill		$ 44,216
Acquisition related cost		1,177
Acquired assets		5,629
Liabilities assumed		1,852
Hoodoo Digital, LLC | CGRLH
Business Acquisition [Line Items]
Goodwill		7,032
Hoodoo Digital, LLC | HMS
Business Acquisition [Line Items]
Goodwill		33,017
Hoodoo Digital, LLC | Customer-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles		16,200
Hoodoo Digital, LLC | Marketing-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles		$ 2,400

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