Accrued Liabilities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Accrued salaries and related expenses	$ 45,816,000		$ 45,816,000		$ 53,844,000
Accrued severance	849,000		849,000		2,280,000
Accrued taxes	43,695,000		43,695,000		26,209,000
Accrued expenses	58,931,000		58,931,000		51,284,000
Accrued service credits	3,943,000		3,943,000		5,996,000
Accrued liabilities	153,234,000		153,234,000		$ 139,613,000
Severance costs	1,886,000	$ 3,297,000	3,046,000	$ 10,646,000
Payments for restructuring	1,804,000	2,221,000	4,119,000	9,242,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs		0
COVID-19 Related
Restructuring Cost and Reserve [Line Items]
Severance costs	0		0	5,000,000
Payments for restructuring	0	1,929,000	120,000	4,156,000
YP Integration Related
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	0	292,000	0	3,190,000
Other
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	1,804,000	0	3,999,000	1,896,000
Marketing Services
Restructuring Cost and Reserve [Line Items]
Severance costs	229,000	2,862,000	1,159,000	9,475,000
SaaS
Restructuring Cost and Reserve [Line Items]
Severance costs	48,000	$ 435,000	222,000	$ 1,171,000
Thryv International
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 1,609,000		$ 1,665,000