Earnings Per Share and Dividends - Reconciliation of the numerator and denominator used in basic and diluted EPS calculations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income attributable to RE/MAX Holdings, Inc.	$ 1,291	$ 3,553	$ 3,489	$ 2,631	$ 2,888	$ 9,173	$ 8,570	$ 4,409	$ 10,964	$ 25,040	$ 26,883
Earnings per share of Class A common stock
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock, basic									$ 0.60	$ 1.41	$ 1.52
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock, diluted									$ 0.60	$ 1.40	$ 1.51
RMCO, LLC
Numerator
Net income attributable to RE/MAX Holdings, Inc.									$ 10,964	$ 25,040	$ 26,883
Common Class A
Denominator for basic net income per share of Class A common stock
Weighted average shares of Class A common stock outstanding	18,386,709	18,196,454	18,123,963	17,974,264	17,837,386	17,826,332	17,808,321	17,775,381	18,170,348	17,812,065	17,737,649
Denominator for diluted net income per share of Class A common stock
Weighted average shares of Class A common stock outstanding	18,386,709	18,196,454	18,123,963	17,974,264	17,837,386	17,826,332	17,808,321	17,775,381	18,170,348	17,812,065	17,737,649
Add dilutive effect of the following:
Weighted average shares of Class A common stock outstanding, diluted	18,748,412	18,368,051	18,146,886	18,033,631	17,978,431	17,840,158	17,833,958	17,817,620	18,324,246	17,867,752	17,767,499
Earnings per share of Class A common stock
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock, basic	$ 0.07	$ 0.20	$ 0.19	$ 0.15	$ 0.16	$ 0.51	$ 0.48	$ 0.25	$ 0.60	$ 1.41	$ 1.52
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock, diluted	$ 0.07	$ 0.19	$ 0.19	$ 0.15	$ 0.16	$ 0.51	$ 0.48	$ 0.25	$ 0.60	$ 1.40	$ 1.51
Restricted stock
Add dilutive effect of the following:
Restricted stock									153,898	55,687	29,850