Allowance for Credit Losses - Allowance for Credit Loss Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			$ 33,368	$ 26,828
Thryv Australia Acquisition, balance as of March 1, 2021			2,733
Additions	$ 2,900	$ 5,300	3,211	27,709
Deductions			(19,833)	(19,598)
Ending balance	19,479	34,939	19,479	34,939
Accounts receivable, allowance for credit loss	19,400	34,500	19,400	34,500
Contract with customer, asset, allowance for credit loss	$ 100	$ 400	$ 100	$ 400