Segment Information - Segment Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 297,290	$ 240,325	$ 868,943	$ 862,507
Segment EBITDA	102,359	69,294	304,045	300,208
Marketing Services
Segment Reporting Information [Line Items]
Revenue	213,210	208,504	643,938	767,553
Segment EBITDA	96,231	66,733	277,546	289,423
SaaS
Segment Reporting Information [Line Items]
Revenue	44,800	31,821	123,437	94,954
Segment EBITDA	(5,508)	2,561	(7,311)	10,785
Thryv International
Segment Reporting Information [Line Items]
Revenue	39,280	0	101,568	0
Segment EBITDA	$ 11,636	$ 0	$ 33,810	$ 0