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Business Acquisitions - Narrative (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 04, 2021 USD ($) | Dec. 31, 2023 USD ($) acquisition | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) acquisition
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,546,065 | $ 1,591,474 | $ 1,531,455
Increase (decrease) in goodwill from adjustment under purchase accounting |  | (72) | $ 4,338 |
Fiscal 2023 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 6,500 |  |
Definite-lived intangibles in connection with acquisition |  | 7,200 |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  | (100) |  |
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] |  |  |  |
Goodwill |  |  | $ 95,737 |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | 4,500 |
Revenue of acquiree since acquisition date |  |  | 33,000 |
Total consideration of transactions |  |  | 121,700 |
Fair value of assets |  | $ 7,400 |  |
Expected income tax deductible amount |  |  | 1,200 |
Goodwill, increase (decrease) in connection with contract liability |  |  | $ 3,200 |
Unfavorable contract liability, accretion period |  |  | 3 years |
Accounts receivable |  |  | $ 7,433 |
Fiscal 2022 Acquisitions | Cybersecurity and Martech |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | $ (100) |
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of immaterial acquisitions | acquisition |  | 2 |  | 4
Fiscal 2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | $ 97,032
Total consideration of transactions |  |  |  | 160,400
Fair value of assets |  |  |  | 9,500
Expected income tax deductible amount |  |  |  | 42,100
Revenues contributed through acquisitions |  |  |  | 39,900
Gross amount due under contracts |  |  |  | 9,900
Amount expected to be uncollectible |  |  |  | 400
Accounts receivable |  |  |  | 9,513
SEOmoz Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 41,329 |  |  | 41,300
Total consideration of transactions | 67,000 |  |  |
Expected income tax deductible amount |  |  |  | 0
Revenues contributed through acquisitions |  |  |  | $ 25,600
Gross amount due under contracts | 3,600 |  |  |
Amount expected to be uncollectible | 300 |  |  |
Accounts receivable | $ 3,278 |  |  |

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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 -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479328/805-10-50-2 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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