Goodwill and Intangible Assets - Narrative (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Mar. 31, 2024 reporting_unit	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) reporting_unit	Dec. 31, 2022 USD ($)
Goodwill [Line Items]
Impairments				$ 83,094,000		$ 268,800,000
Goodwill	$ 218,884,000			218,884,000		$ 302,400,000	$ 566,004,000
Number of reporting units | reporting_unit		2				4
Amortization expense	3,300,000		$ 6,400,000	13,700,000	$ 19,100,000
Thryv Marketing Services
Goodwill [Line Items]
Impairments	83,100,000			83,094,000		$ 268,800,000
Goodwill	$ 0			$ 0		$ 83,516,000	$ 347,120,000