Goodwill and Intangible Assets - Schedule of Goodwill Rollforward (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance		$ 302,400,000	$ 566,004,000
Yellow Acquisition			5,129,000
Impairments		(83,094,000)	(268,800,000)
Effects of foreign currency translation		(422,000)	67,000
Ending balance	$ 218,884,000	218,884,000	302,400,000
Thryv Marketing Services
Goodwill [Roll Forward]
Beginning balance		83,516,000	347,120,000
Yellow Acquisition			5,129,000
Impairments	(83,100,000)	(83,094,000)	(268,800,000)
Effects of foreign currency translation		(422,000)	67,000
Ending balance	0	0	83,516,000
Thryv SaaS
Goodwill [Roll Forward]
Beginning balance		218,884,000	218,884,000
Yellow Acquisition			0
Impairments		0	0
Effects of foreign currency translation		0	0
Ending balance	$ 218,884,000	$ 218,884,000	$ 218,884,000