Income Taxes - Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
U.S. statutory tax rate	21.00%	21.00%	21.00%
State and local taxes, net of federal benefit	2.70%	3.10%	3.10%
Income attributable to non-controlling interests	(9.30%)	(9.30%)	(9.90%)
Subtotal	14.40%	14.80%	14.20%
Non-creditable foreign and domestic taxes - non-controlling interest	14.00%	(7.00%)	5.10%
Non-creditable foreign taxes - RE/MAX Holdings	8.10%	(3.70%)	2.10%
Foreign derived intangible income deduction		4.40%	(3.10%)
Other permanent differences	4.30%	(1.20%)	2.00%
Uncertain Tax Positions		6.10%	1.90%
Loss on contract settlement		(26.70%)
Adjustments to state taxes		3.90%
162(m) compensation limitation	1.10%	(1.80%)
Conversions of acquired C-Corporations to pass-through entities			8.40%
Other	(1.20%)	0.10%	0.20%
Effective tax rate	40.70%	(11.10%)	30.80%
Percentage of non controlling interest income not subject to income taxes	40.00%
RIHI | RMCO, LLC
Non-controlling interest ownership of common units in RMCO	41.30%	40.00%
RIHI | RMCO, LLC | Maximum
Non-controlling interest ownership of common units in RMCO	40.00%