Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 297,290	$ 240,325	$ 868,943	$ 862,507
Marketing Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	213,210	208,504	643,938	767,553
Marketing Services | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	106,931	79,395	313,595	355,942
Marketing Services | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	58,914	68,169	184,013	212,436
Marketing Services | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	31,887	40,247	98,521	130,905
Marketing Services | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	15,478	20,693	47,809	68,270
SaaS
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	44,800	31,821	123,437	94,954
SaaS | Thryv Platform
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	27,268	24,935	79,966	74,466
SaaS | Thryv Add-ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	17,532	6,886	43,471	20,488
Thryv International
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	39,280	0	101,568	0
Thryv International | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	10,159	0	31,112	0
Thryv International | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	16,105	0	39,742	0
Thryv International | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,642	0	13,671	0
Thryv International | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	7,243	0	16,903	0
Thryv International | Thryv Platform and Thryv Add-Ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 131	$ 0	$ 140	$ 0