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Business Acquisitions - Narrative (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 04, 2021 USD ($) | Oct. 28, 2020 USD ($) | Dec. 31, 2021 USD ($) subsidiary | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 21, 2019 USD ($) | Apr. 19, 2019 USD ($) | Apr. 02, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | $ (932,000) | $ 7,591,000 |  |  |  |
Goodwill |  |  | 97,032,000 | 202,901,000 |  |  |  |
Fiscal 2021 Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  | 39,900,000 |  |  |  |  |
Total consideration of transactions |  |  | 160,400,000 |  |  |  |  |
Fair value of accounts receivable acquired |  |  | 9,500,000 |  |  |  |  |
Gross amount due under contracts |  |  | 9,900,000 |  |  |  |  |
Amount expected to be uncollectible |  |  | 400,000 |  |  |  |  |
Expected income tax deductible amount |  |  | 42,100,000 |  |  |  |  |
Fiscal 2021 Acquisitions | Digital Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | (1,400,000) |  |  |  |  |
Fiscal 2021 Acquisitions | Cybersecurity and Martech |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | 500,000 |  |  |  |  |
SEOmoz Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  | 25,600,000 |  |  |  |  |
Total consideration of transactions | $ 67,000,000 |  |  |  |  |  |  |
Gross amount due under contracts | 3,600,000 |  |  |  |  |  |  |
Amount expected to be uncollectible | $ 300,000 |  |  |  |  |  |  |
Expected income tax deductible amount |  |  | $ 0 |  |  |  |  |
Fiscal 2020 Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  | 54,600,000 |  |  |  |
Total consideration of transactions |  |  |  | 472,800,000 |  |  |  |
Fair value of accounts receivable acquired |  |  |  | 46,100,000 |  |  |  |
Gross amount due under contracts |  |  |  | 53,000,000 |  |  |  |
Amount expected to be uncollectible |  |  |  | 6,900,000 |  |  |  |
Goodwill |  |  |  | 202,900,000 |  |  |  |
Expected income tax deductible amount |  |  |  | 55,000,000 |  |  |  |
Pro forma net income for existing line of business |  |  |  | 100,000 | $ 28,200,000 |  |  |
Pro forma net income for assets sold |  |  |  | 8,400,000 | 13,900,000 |  |  |
Fiscal 2020 Acquisitions | Digital Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | 9,700,000 |  |  |  |
Fiscal 2020 Acquisitions | Cybersecurity and Martech |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | 2,100,000 |  |  |  |
RetailMeNot, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  | 47,600,000 |  |  |  |
Total consideration of transactions |  | $ 414,400,000 |  |  |  |  |  |
Fair value of accounts receivable acquired |  | 40,500,000 |  |  |  |  |  |
Gross amount due under contracts |  | 47,200,000 |  |  |  |  |  |
Amount expected to be uncollectible |  | $ 6,700,000 |  |  |  |  |  |
Goodwill |  |  |  | 169,600,000 |  |  |  |
Expected income tax deductible amount |  |  |  | 36,600,000 |  |  |  |
Pro forma net income for existing line of business |  |  |  | 100,000 | 28,200,000 |  |  |
Pro forma net income for assets sold |  |  |  | $ 8,400,000 | 13,900,000 |  |  |
Fiscal 2019 Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  |  | 126,300,000 |  |  |
Total consideration of transactions |  |  |  |  | 429,500,000 |  |  |
Fair value of accounts receivable acquired |  |  |  |  | 22,800,000 |  |  |
Gross amount due under contracts |  |  |  |  | 23,700,000 |  |  |
Amount expected to be uncollectible |  |  |  |  | 900,000 |  |  |
Goodwill |  |  |  |  | 253,100,000 |  |  |
Expected income tax deductible amount |  |  |  |  | 95,100,000 |  |  |
Fiscal 2019 Acquisitions | Digital Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  |  | (900,000) |  |  |
Fiscal 2019 Acquisitions | Fax and Martech Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  |  | 200,000 |  |  |
Highwinds Capital, Inc. and Cloak Holdings, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  |  | 53,000,000 |  |  |
Gross amount due under contracts |  |  |  |  |  |  |  | $ 1,000,000
Amount expected to be uncollectible |  |  |  |  |  |  |  | $ 100,000
Expected income tax deductible amount |  |  |  |  | 15,200,000 |  |  |
BabyCenter LLC. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  |  | 19,200,000 |  |  |
Gross amount due under contracts |  |  |  |  |  |  | $ 10,500,000 |
Amount expected to be uncollectible |  |  |  |  |  |  | $ 200,000 |
Expected income tax deductible amount |  |  |  |  | 34,600,000 |  |  |
Spiceworks, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues contributed through acquisitions |  |  |  |  | 23,000,000 |  |  |
Gross amount due under contracts |  |  |  |  |  | $ 10,800,000 |  |
Amount expected to be uncollectible |  |  |  |  |  | $ 400,000 |  |
Expected income tax deductible amount |  |  |  |  | $ 0 |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of immaterial acquisitions | subsidiary |  |  | 4 |  |  |  |  |

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