Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information
Total revenue	$ 78,478	$ 81,223	$ 235,218	$ 249,071
Real Estate
Segment Reporting Information
Total revenue	54,639	56,563	163,836	174,752
Mortgage
Segment Reporting Information
Total revenue	3,741	3,640	11,051	10,444
Marketing Funds fees
Segment Reporting Information
Total revenue	20,098	20,853	60,331	63,272
Other
Segment Reporting Information
Total revenue		167		603
Continuing franchise fees
Segment Reporting Information
Total revenue	30,798	31,834	92,223	96,011
Continuing franchise fees | Real Estate
Segment Reporting Information
Total revenue	28,126	29,040	84,134	87,974
Continuing franchise fees | Mortgage
Segment Reporting Information
Total revenue	2,672	2,794	8,089	8,037
Annual dues
Segment Reporting Information
Total revenue	7,969	8,456	24,345	25,661
Annual dues | Real Estate
Segment Reporting Information
Total revenue	7,969	8,456	24,345	25,661
Broker fees
Segment Reporting Information
Total revenue	14,915	14,255	40,159	39,468
Broker fees | Real Estate
Segment Reporting Information
Total revenue	14,915	14,255	40,159	39,468
Franchise sales and other revenue
Segment Reporting Information
Total revenue	4,698	5,825	18,160	24,659
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	3,629	4,812	15,198	21,649
Franchise sales and other revenue | Mortgage
Segment Reporting Information
Total revenue	$ 1,069	$ 846	$ 2,962	$ 2,407