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Description of Business and Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) segment plan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Asset Impairment Charges [Abstract] |  |  |  |
Number of reportable segments | segment |  | 2 |  |
Benefit period |  | 18 months |  |
Goodwill, impairment loss |  | $ 83,094,000 | $ 268,800,000 |
Goodwill |  | 253,318,000 | 302,400,000 | $ 566,004,000
Gain (loss) on foreign currency transaction |  | (4,100,000) | (700,000) | 1,600,000
Advertising expense |  | $ 10,700,000 | 14,800,000 | 29,300,000
Minimum |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Period of invoice (in days) |  | 20 days |  |
Requisite service period, options (in years) |  | 3 years |  |
Maximum |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Period of invoice (in days) |  | 30 days |  |
Requisite service period, options (in years) |  | 4 years |  |
Pension Plan |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Number of pension plans | plan |  | 2 |  |
Non-Qualified Pension Plan |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Number of pension plans | plan |  | 2 |  |
Thryv Marketing Services |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Goodwill, impairment loss | $ 83,100,000 | $ 83,094,000 | 268,800,000 | 102,000,000.0
Goodwill | $ 0 | $ 0 | $ 83,516,000 | $ 347,120,000
Local SMBs | Revenue Benchmark | Customer Concentration Risk |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Percentage of long-lived assets held outside of the United States |  | 92.00% |  |
Regional and National Large Businesses | Revenue Benchmark | Customer Concentration Risk |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Percentage of long-lived assets held outside of the United States |  | 8.00% |  |
Top Ten Directories | Revenue Benchmark | Customer Concentration Risk |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Percentage of long-lived assets held outside of the United States |  | 2.00% |  |

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