Segment Information - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information
Total revenue	$ 88,943	$ 90,997	$ 272,119	$ 240,538
Real Estate
Segment Reporting Information
Total revenue	62,655	64,623	193,168	172,068
Mortgage
Segment Reporting Information
Total revenue	3,194	2,620	9,337	7,353
Marketing Funds fees
Segment Reporting Information
Total revenue	22,736	23,269	68,496	59,456
Other.
Segment Reporting Information
Total revenue	358	485	1,118	1,661
Continuing franchise fees
Segment Reporting Information
Total revenue	33,310	32,464	100,937	84,793
Continuing franchise fees | Real Estate
Segment Reporting Information
Total revenue	30,682	30,416	93,421	79,064
Continuing franchise fees | Mortgage
Segment Reporting Information
Total revenue	2,628	2,048	7,516	5,729
Annual dues
Segment Reporting Information
Total revenue	8,911	8,967	26,847	26,508
Annual dues | Real Estate
Segment Reporting Information
Total revenue	8,911	8,967	26,847	26,508
Broker fees
Segment Reporting Information
Total revenue	16,596	19,245	50,998	48,651
Broker fees | Real Estate
Segment Reporting Information
Total revenue	16,596	19,245	50,998	48,651
Franchise sales and other revenue
Segment Reporting Information
Total revenue	7,390	7,052	24,841	21,130
Franchise sales and other revenue | Real Estate
Segment Reporting Information
Total revenue	6,466	5,995	21,902	17,845
Franchise sales and other revenue | Mortgage
Segment Reporting Information
Total revenue	$ 566	$ 572	$ 1,821	$ 1,624