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Business acquisitions - Hoodoo Digital, LLC. - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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
Acquisition related cost | $ 1,177 | $ 2,650 | $ 8,352
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 |  |
Indemnification assets | 278 |  |
Hoodoo Digital, LLC | BCMI |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 4,167 |  |
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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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