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Business Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 28, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  | $ 7,591 | $ (681) |  |
Goodwill |  | 218,745 | 253,096 |  |
Fiscal 2020 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues contributed through acquisitions |  | 61,900 |  |  |
Total consideration of transactions |  | 497,800 |  |  |
Fair value of accounts receivable acquired |  | 46,300 |  |  |
Gross amount due under contracts |  | 53,200 |  |  |
Amount expected to be uncollectible |  | 6,900 |  |  |
Goodwill |  | 218,700 |  |  |
Expected income tax deductible amount |  | 70,800 |  |  |
Revenues |  | 1,671,955 | 1,633,861 |  |
Fiscal 2020 Acquisitions | Voice, Backup, Security, and CPP |  |  |  |  |
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] |  |  |  |  |
Revenues contributed through acquisitions |  | 47,600 |  |  |
Total consideration of transactions | $ 414,400 |  |  |  |
Fair value of accounts receivable acquired | 40,500 |  |  |  |
Gross amount due under contracts | 47,200 |  |  |  |
Amount expected to be uncollectible | $ 6,700 |  |  |  |
Goodwill |  | 169,600 |  |  |
Expected income tax deductible amount |  | 36,600 |  |  |
Revenues |  | 1,639,495 | 1,589,437 |  |
Pro forma net income for existing line of business |  | 100 | 28,200 |  |
Pro forma net income for assets sold |  | $ 8,400 | 13,900 |  |
Fiscal 2019 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues contributed through acquisitions |  |  | 126,300 |  |
Total consideration of transactions |  |  | 429,500 |  |
Fair value of accounts receivable acquired |  |  | 22,800 |  |
Gross amount due under contracts |  |  | 23,700 |  |
Amount expected to be uncollectible |  |  | 900 |  |
Goodwill |  |  | 253,100 |  |
Expected income tax deductible amount |  |  | 95,100 |  |
Revenues |  |  | 1,474,132 | $ 1,427,914 |
Fiscal 2019 Acquisitions | Digital Media |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | (900) |  |
Fiscal 2019 Acquisitions | Fax and Martech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  | $ 200 |  |
Fiscal 2018 Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues contributed through acquisitions |  |  |  | 56,200 |
Total consideration of transactions |  |  |  | 324,700 |
Fair value of accounts receivable acquired |  |  |  | 15,500 |
Gross amount due under contracts |  |  |  | 11,600 |
Amount expected to be uncollectible |  |  |  | 300 |
Goodwill |  |  |  | 194,300 |
Expected income tax deductible amount |  |  |  | 38,300 |
Revenues |  |  |  | 1,264,544 | $ 1,218,530
Pro forma net income for subsidiaries sold |  |  |  |  | $ 22,700
Fiscal 2018 Acquisitions | Voice, Backup, Security, and CPP |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | (1,000) |
Fiscal 2018 Acquisitions | Digital Media |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  |  |  | $ 200 |

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