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Business acquisitions - SomethingDigital.Com LLC - Narrative (Details) $ in Thousands			12 Months Ended
	Dec. 31, 2021 USD ($)	Oct. 05, 2020 USD ($) numberOfOperatingSegment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Payment for business acquisitions, net of cash acquired			$ 33	$ 72,025	$ 186,633
Goodwill	$ 1,731,027		1,684,196	1,731,027	1,695,688
Goodwill deductible for tax purposes	$ 326,795		$ 291,377	326,795
Acquisition related cost				$ 1,177	$ 2,650
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 | Consumer Goods Retail Life Sciences And Healthcare [Member]
Business Acquisition [Line Items]
Goodwill		30,373
SomethingDigital.Com LLC | High Tech and Manufacturing
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%			100.00%
Purchase consideration	$ 66,721
Payment for business acquisitions, net of cash acquired	64,439
Cash and cash equivalents	2,283
Cash consideration to acquired certain assets and assumed certain liabilities	67,695
Consideration receivable	$ 973			$ 973
Acquired intangible assets, weighted average amortization period	5 years
Goodwill	$ 46,033			46,033
Acquisition related cost	1,177
Acquired assets	5,629			5,629
Liabilities assumed	1,852			1,852
Hoodoo Digital, LLC | Consumer Goods Retail Life Sciences And Healthcare [Member]
Business Acquisition [Line Items]
Goodwill	7,321			7,321
Hoodoo Digital, LLC | High Tech and Manufacturing
Business Acquisition [Line Items]
Goodwill	34,374			34,374
Hoodoo Digital, LLC | Customer-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles	16,200			16,200
Hoodoo Digital, LLC | Marketing-related intangible assets
Business Acquisition [Line Items]
Acquired intangibles	$ 2,400			$ 2,400

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