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Business acquisitions - Hoodoo Digital, LLC. - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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
Acquisition related cost			$ 1,177	$ 2,650
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
Taxation, purchase accounting adjustments		1,688
Purchase accounting adjustments, outstanding		$ 682
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
Indemnification assets	278		278
Hoodoo Digital, LLC | Financial Services
Business Acquisition [Line Items]
Goodwill	4,338		4,338
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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