Business Combinations - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 02, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Payments to acquire businesses				$ 608,000	$ 0
Acquisition-related costs		$ 5,616		7,723
RentPath holdings
Business Acquisition [Line Items]
Payments to acquire businesses	$ 608,000
Revenues		42,548
Net income (loss)		(32,698)	$ (13,968)	(75,364)	(84,017)
RentPath holdings | Acquisition-related Costs
Business Acquisition [Line Items]
Net income (loss)		$ (4,821)	$ (28,876)	$ (76,095)	$ (39,073)