Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 291,047	$ 303,612	$ 571,653	$ 622,182
Marketing Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	202,795	272,327	430,728	559,049
Marketing Services | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	93,753	139,160	206,664	276,547
Marketing Services | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	61,004	69,321	125,099	144,267
Marketing Services | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	32,202	40,951	66,634	90,659
Marketing Services | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	15,836	22,895	32,331	47,576
SaaS
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	41,386	31,285	78,637	63,133
SaaS | Thryv Platform
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	26,798	24,263	52,698	49,531
SaaS | Thryv Add-ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	14,588	7,022	25,939	13,602
Thryv International
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	46,866	0	62,288	0
Thryv International | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	15,231	0	20,944	0
Thryv International | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	18,361	0	24,931	0
Thryv International | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,030	0	8,031	0
Thryv International | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	7,235	0	8,373	0
Thryv International | Thryv Platform
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6	0	6	0
Thryv International | Thryv Add-ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 3	$ 0	$ 3	$ 0