Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information
Total revenue	$ 81,223	$ 88,943	$ 249,071	$ 272,119
Real Estate
Segment Reporting Information
Total revenue	56,563	62,655	174,752	193,168
Mortgage
Segment Reporting Information
Total revenue	3,640	3,194	10,444	9,337
Marketing Funds fees
Segment Reporting Information
Total revenue	20,853	22,736	63,272	68,496
Other.
Segment Reporting Information
Total revenue	167	358	603	1,118
Continuing franchise fees
Segment Reporting Information
Total revenue	31,834	33,310	96,011	100,937
Continuing franchise fees | Real Estate
Segment Reporting Information
Total revenue	29,040	30,682	87,974	93,421
Continuing franchise fees | Mortgage
Segment Reporting Information
Total revenue	2,794	2,628	8,037	7,516
Annual dues
Segment Reporting Information
Total revenue	8,456	8,911	25,661	26,847
Annual dues | Real Estate
Segment Reporting Information
Total revenue	8,456	8,911	25,661	26,847
Broker fees
Segment Reporting Information
Total revenue	14,255	16,596	39,468	50,998
Broker fees | Real Estate
Segment Reporting Information
Total revenue	14,255	16,596	39,468	50,998
Franchise sales and other revenue
Segment Reporting Information
Total revenue	5,825	7,390	24,659	24,841
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	4,812	6,466	21,649	21,902
Franchise sales and other revenue | Mortgage
Segment Reporting Information
Total revenue	$ 846	$ 566	$ 2,407	$ 1,821