Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 74,467	$ 78,287
Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	7,032	8,055
Real Estate
Disaggregation of Revenue [Line Items]
Total revenue	52,476	54,448
Real Estate | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	46,046	47,306
Real Estate | Franchise sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,430	7,142
Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	18,864	20,206
Mortgage
Disaggregation of Revenue [Line Items]
Total revenue	3,127	3,633
UNITED STATES | Company -Owned Regions | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	30,258	31,739
UNITED STATES | Independent Regions | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,397	1,468
UNITED STATES | Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	14,247	15,366
CANADA | Company -Owned Regions | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	9,692	9,903
CANADA | Independent Regions | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	650	728
CANADA | Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	4,373	4,616
Global | Global. | Fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	4,049	3,468
Global | Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue	$ 244	$ 224