Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information
Total revenue	$ 72,750	$ 78,453	$ 147,217	$ 156,740
Real Estate
Segment Reporting Information
Total revenue	50,836	54,749	103,312	109,197
Mortgage
Segment Reporting Information
Total revenue	3,641	3,677	6,768	7,310
Operating Segments \| Real Estate
Segment Reporting Information
Total revenue	50,836	54,749	103,312	109,197
Operating Segments \| Mortgage
Segment Reporting Information
Total revenue	3,641	3,677	6,768	7,310
Operating Segments \| Marketing Funds fees
Segment Reporting Information
Total revenue	18,273	20,027	37,137	40,233
Continuing franchise fees
Segment Reporting Information
Total revenue	28,992	30,340	58,343	61,425
Continuing franchise fees \| Operating Segments \| Real Estate
Segment Reporting Information
Total revenue	26,484	27,643	53,310	56,008
Continuing franchise fees \| Operating Segments \| Mortgage
Segment Reporting Information
Total revenue	2,508	2,697	5,033	5,417
Annual dues
Segment Reporting Information
Total revenue	7,693	8,151	15,482	16,376
Annual dues \| Operating Segments \| Real Estate
Segment Reporting Information
Total revenue	7,693	8,151	15,482	16,376
Broker fees
Segment Reporting Information
Total revenue	13,454	14,528	24,885	25,244
Broker fees \| Operating Segments \| Real Estate
Segment Reporting Information
Total revenue	13,454	14,528	24,885	25,244
Franchise sales and other revenue
Segment Reporting Information
Total revenue	4,338	5,407	11,370	13,462
Franchise sales and other revenue \| Real Estate
Segment Reporting Information
Total revenue	3,205	4,427	9,635	11,569
Franchise sales and other revenue \| Operating Segments \| Real Estate
Segment Reporting Information
Total revenue	3,205	4,427	9,635	11,569
Franchise sales and other revenue \| Operating Segments \| Mortgage
Segment Reporting Information
Total revenue	$ 1,133	$ 980	$ 1,735	$ 1,893