Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 72,750	$ 78,453	$ 147,217	$ 156,740
Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	4,338	5,407	11,370	13,462
Real Estate
Disaggregation of Revenue [Line Items]
Total revenue	50,836	54,749	103,312	109,197
Real Estate \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	47,631	50,322	93,677	97,628
Real Estate \| Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	3,205	4,427	9,635	11,569
Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	18,273	20,027	37,137	40,233
Mortgage
Disaggregation of Revenue [Line Items]
Total revenue	3,641	3,677	6,768	7,310
UNITED STATES \| Company -Owned Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	31,701	33,977	61,959	65,716
UNITED STATES \| Independent Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,499	1,574	2,896	3,042
UNITED STATES \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	13,664	14,964	27,911	30,330
CANADA \| Company -Owned Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	9,949	10,603	19,641	20,506
CANADA \| Independent Regions \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	689	659	1,339	1,387
CANADA \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	4,314	4,804	8,687	9,420
Global \| Global. \| Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	3,793	3,509	7,842	6,977
Global \| Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	$ 295	$ 259	$ 539	$ 483