Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 240,325	$ 319,116	$ 862,507	$ 1,076,244
Marketing Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	208,504	287,794	767,553	980,072
Marketing Services | PYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	79,395	120,977	355,942	452,098
Marketing Services | IYP
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	68,169	82,385	212,436	257,977
Marketing Services | SEM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	40,247	56,700	130,905	179,143
Marketing Services | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	20,693	27,732	68,270	90,854
SaaS
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	31,821	31,322	94,954	96,172
SaaS | Thryv Platform
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	22,324	22,829	67,518	72,877
SaaS | Thryv Leads and Add-ons
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 9,497	$ 8,493	$ 27,436	$ 23,295