Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 280,606	$ 318,570
Marketing Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	227,933	286,722
Marketing Services | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	112,911	137,387
Marketing Services | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	64,095	74,946
Marketing Services | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	34,432	49,708
Marketing Services | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	16,495	24,681
SaaS
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	37,251	31,848
SaaS | Thryv Platform
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	25,900	25,268
SaaS | Thryv Add-ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	11,351	6,580
Thryv International
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	15,422	0
Thryv International | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,713	0
Thryv International | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,570	0
Thryv International | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	2,001	0
Thryv International | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 1,138	$ 0