Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 68,510	$ 72,750	$ 138,738	$ 147,217
Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	4,552	4,338	11,954	11,370
Real Estate
Disaggregation of Revenue [Line Items]
Total revenue	48,824	50,836	99,380	103,312
Real Estate \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	45,294	47,631	89,152	93,677
Real Estate \| Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	3,530	3,205	10,228	9,635
Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	16,787	18,273	33,653	37,137
Mortgage
Disaggregation of Revenue [Line Items]
Total revenue	2,899	3,641	5,705	6,768
UNITED STATES \| Company -Owned Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	29,698	31,701	57,525	61,959
UNITED STATES \| Independent Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,417	1,499	2,753	2,896
UNITED STATES \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	12,453	13,664	24,840	27,911
CANADA \| Company -Owned Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	9,262	9,949	18,775	19,641
CANADA \| Independent Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	712	689	1,429	1,339
CANADA \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	4,017	4,314	8,227	8,687
Global \| Global. \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	4,205	3,793	8,670	7,842
Global \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	$ 317	$ 295	$ 586	$ 539