Business Combinations - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 02, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Payments to acquire businesses				$ 608,000	$ 0
Acquisition-related costs		$ 202		7,925
RentPath holdings
Business Acquisition [Line Items]
Payments to acquire businesses	$ 608,000
Revenues		40,406		82,954
Net income (loss)		(18,792)	$ 23,099	(94,335)	(60,918)
RentPath holdings | Acquisition-related Costs
Business Acquisition [Line Items]
Net income (loss)		$ (23)	$ (9,151)	$ (76,118)	$ (48,224)