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Business Acquisitions - Narrative (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 04, 2021 USD ($) | Oct. 28, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) subsidiary | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,591,474 | $ 1,531,455 | $ 1,525,000
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | 4,338 | (932) |
Change in amount of contingent consideration, asset |  |  | $ 3,200 |  |
Business combination, contingent consideration arrangement, recognition period |  |  | 3 years |  |
Goodwill acquired |  |  | $ 95,737 | 97,032 |
Lifecycle Marketing Group Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity interest acquired (percentage) |  |  | 100.00% |  |
FitNow, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity interest acquired (percentage) |  |  | 100.00% |  |
Fiscal 2022 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue of acquiree since acquisition date, |  |  |  | 33,000 |
Total consideration of transactions |  |  |  | $ 121,700 |
Fair value of assets |  |  | $ 7,400 |  |
Goodwill |  |  | 95,737 |  |
Expected income tax deductible amount |  |  | 1,200 |  |
Fiscal 2022 Acquisitions | Cybersecurity and Martech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | (100) |  |
Fiscal 2022 Acquisitions | Digital Media |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | $ 4,500 |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of immaterial acquisitions | subsidiary |  |  |  | 4 |
Fiscal 2021 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total consideration of transactions |  |  |  | $ 160,400 |
Fair value of assets |  |  |  | 9,500 |
Amount expected to be uncollectible |  |  |  | 400 |
Goodwill |  |  |  | 97,032 |
Expected income tax deductible amount |  |  |  | 42,100 |
Revenues contributed through acquisitions |  |  |  | 39,900 |
Gross amount due under contracts |  |  |  | 9,900 |
SEOmoz Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total consideration of transactions | $ 67,000 |  |  |  |
Amount expected to be uncollectible | 300 |  |  |  |
Goodwill | 41,329 |  |  | 41,300 |
Expected income tax deductible amount |  |  |  | 0 |
Revenues contributed through acquisitions |  |  |  | 25,600 |
Gross amount due under contracts | $ 3,600 |  |  |  |
SEOmoz Acquisition | Cybersecurity and Martech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | 500 |
SEOmoz Acquisition | Digital Media |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | $ (1,400) |
Fiscal 2020 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total consideration of transactions |  |  |  |  | 472,800
Fair value of assets |  |  |  |  | 46,100
Amount expected to be uncollectible |  |  |  |  | 6,900
Goodwill |  |  |  |  | 202,901
Expected income tax deductible amount |  |  |  |  | 55,000
Revenues contributed through acquisitions |  |  |  |  | 54,600
Gross amount due under contracts |  |  |  |  | 53,000
Goodwill acquired |  |  |  |  | 202,900
Pro forma net income for existing line of business |  |  |  |  | 100
Pro forma net income for assets sold |  |  |  |  | 8,400
Fiscal 2020 Acquisitions | Cybersecurity and Martech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  |  | (2,100)
Fiscal 2020 Acquisitions | Digital Media |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  |  | 9,700
RetailMeNot, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total consideration of transactions |  | $ 414,400 |  |  |
Fair value of assets |  | 40,500 |  |  |
Amount expected to be uncollectible |  | 6,700 |  |  |
Goodwill |  | 169,581 |  |  |
Expected income tax deductible amount |  |  |  |  | 36,600
Revenues contributed through acquisitions |  |  |  |  | 47,600
Gross amount due under contracts |  | $ 47,200 |  |  |
Goodwill acquired |  |  |  |  | $ 169,600

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6578-128477 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 55 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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