Income Taxes - Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
U.S. statutory tax rate	21.00%	21.00%	21.00%	35.00%
State and local taxes, net of federal benefit	3.10%	3.10%	3.10%
Income attributable to non-controlling interests	(9.90%)	(10.00%)	(10.00%)
Subtotal	14.20%	14.10%	14.10%
Non-creditable foreign taxes - non-controlling interest	5.10%	2.80%	2.70%
Non-creditable foreign taxes - RE/MAX Holdings	2.10%	1.10%	1.20%
Foreign derived intangible income deduction	(3.10%)	(1.50%)	(1.30%)
Other permanent differences	2.00%	0.70%	0.40%
Uncertain Tax Positions	1.90%	1.00%	0.80%
Impact of TRA adjustment on NCI			0.70%
Effect of permanent difference - TRA adjustment			(2.20%)
Valuation allowance recognized on basis step-ups			9.50%
Conversions of acquired C-Corporations to pass-through entities	8.40%
Other	0.70%	0.70%	(1.20%)
Effective tax rate	31.30%	18.90%	24.70%
Percentage of Non Controlling Interest Income not Subject to Income Taxes	40.00%
Percentage of Foreign Taxes Paid Attributable to Non Controlling Interest	40.00%
Valuation allowance against related deferred tax assets	$ 6,834	$ 7,184	$ 6,300
Value of TRA liability			$ 6,100