Segment Information - Segment Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 291,047	$ 303,612	$ 571,653	$ 622,182
Segment EBITDA	96,753	118,135	201,686	230,914
Marketing Services
Segment Reporting Information [Line Items]
Revenue	202,795	272,327	430,728	559,049
Segment EBITDA	82,684	112,612	181,315	222,690
SaaS
Segment Reporting Information [Line Items]
Revenue	41,386	31,285	78,637	63,133
Segment EBITDA	(2,119)	5,523	(1,803)	8,224
Thryv International
Segment Reporting Information [Line Items]
Revenue	46,866	0	62,288	0
Segment EBITDA	$ 16,188	$ 0	$ 22,174	$ 0