Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information
Total revenue	$ 78,453	$ 82,447	$ 156,740	$ 167,848
Real Estate
Segment Reporting Information
Total revenue	54,749	57,559	109,197	118,189
Mortgage
Segment Reporting Information
Total revenue	3,677	3,616	7,310	6,804
Marketing Funds fees
Segment Reporting Information
Total revenue	20,027	21,077	40,233	42,419
Other.
Segment Reporting Information
Total revenue		195		436
Continuing franchise fees
Segment Reporting Information
Total revenue	30,340	32,101	61,425	64,177
Continuing franchise fees | Real Estate
Segment Reporting Information
Total revenue	27,643	29,387	56,008	58,934
Continuing franchise fees | Mortgage
Segment Reporting Information
Total revenue	2,697	2,714	5,417	5,243
Annual dues
Segment Reporting Information
Total revenue	8,151	8,587	16,376	17,205
Annual dues | Real Estate
Segment Reporting Information
Total revenue	8,151	8,587	16,376	17,205
Broker fees
Segment Reporting Information
Total revenue	14,528	14,321	25,244	25,213
Broker fees | Real Estate
Segment Reporting Information
Total revenue	14,528	14,321	25,244	25,213
Franchise sales and other revenue
Segment Reporting Information
Total revenue	5,407	6,361	13,462	18,834
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	4,427	5,264	11,569	16,837
Franchise sales and other revenue | Mortgage
Segment Reporting Information
Total revenue	$ 980	$ 902	$ 1,893	$ 1,561