Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information
Total revenue	$ 78,287	$ 85,401
Real Estate
Segment Reporting Information
Total revenue	54,448	60,630
Mortgage
Segment Reporting Information
Total revenue	3,633	3,188
Marketing Funds fees
Segment Reporting Information
Total revenue	20,206	21,342
Other.
Segment Reporting Information
Total revenue		241
Continuing franchise fees
Segment Reporting Information
Total revenue	31,085	32,076
Continuing franchise fees | Real Estate
Segment Reporting Information
Total revenue	28,365	29,547
Continuing franchise fees | Mortgage
Segment Reporting Information
Total revenue	2,720	2,529
Annual dues
Segment Reporting Information
Total revenue	8,225	8,618
Annual dues | Real Estate
Segment Reporting Information
Total revenue	8,225	8,618
Broker fees
Segment Reporting Information
Total revenue	10,716	10,892
Broker fees | Real Estate
Segment Reporting Information
Total revenue	10,716	10,892
Franchise sales and other revenue
Segment Reporting Information
Total revenue	8,055	12,473
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	7,142	11,573
Franchise sales and other revenue | Mortgage
Segment Reporting Information
Total revenue	$ 913	$ 659