Segment Information - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information
Total revenue	$ 307,685	$ 325,671	$ 353,386
Real Estate
Segment Reporting Information
Total revenue	214,093	227,182	249,272
Mortgage
Segment Reporting Information
Total revenue	14,609	13,993	12,388
Other
Segment Reporting Information
Total revenue		635	1,407
Operating Segments | Real Estate
Segment Reporting Information
Total revenue	214,093	227,182	249,272
Operating Segments | Mortgage
Segment Reporting Information
Total revenue	14,609	13,993	12,388
Operating Segments | Marketing Funds fees
Segment Reporting Information
Total revenue	78,983	83,861	90,319
Operating Segments | Total reportable segments revenue
Segment Reporting Information
Total revenue	307,685	325,036	351,979
Operating Segments | Other
Segment Reporting Information
Total revenue		635	1,407
Continuing franchise fees
Segment Reporting Information
Total revenue	122,011	127,384	133,389
Continuing franchise fees | Operating Segments | Real Estate
Segment Reporting Information
Total revenue	111,260	116,472	123,272
Continuing franchise fees | Operating Segments | Mortgage
Segment Reporting Information
Total revenue	10,751	10,912	10,117
Annual dues
Segment Reporting Information
Total revenue	32,188	33,904	35,676
Annual dues | Operating Segments | Real Estate
Segment Reporting Information
Total revenue	32,188	33,904	35,676
Broker fees
Segment Reporting Information
Total revenue	51,816	51,012	62,939
Broker fees | Operating Segments | Real Estate
Segment Reporting Information
Total revenue	51,816	51,012	62,939
Franchise sales and other revenue
Segment Reporting Information
Total revenue	22,687	29,510	31,063
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	18,829	25,794	27,385
Franchise sales and other revenue | Operating Segments | Real Estate
Segment Reporting Information
Total revenue	18,829	25,794	27,385
Franchise sales and other revenue | Operating Segments | Mortgage
Segment Reporting Information
Total revenue	$ 3,858	$ 3,081	$ 2,271