Quarterly Financial Information - Schedule of Quarterly Financial Information (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
Quarterly Financial Information [Line Items]
Total revenue	$ 72,449	$ 71,073	$ 52,207	$ 70,272	$ 68,193	$ 71,541	$ 71,381	$ 71,178	$ 266,001	$ 282,293	$ 212,626
Total operating expenses	65,701	60,258	43,525	58,509	58,213	48,097	49,311	58,233	227,993	213,854	134,775
Operating income	6,748	10,815	8,682	11,763	9,980	23,444	22,070	12,945	38,008	68,439	77,851
Total other expenses, net	(2,110)	(2,040)	(2,052)	(2,683)	(2,416)	(2,727)	(2,751)	(2,780)	(8,885)	(10,674)	(11,687)
Income before provision for income taxes	4,638	8,775	6,630	9,080	7,564	20,717	19,319	10,165	29,123	57,765	66,164
Provision for income taxes	(2,556)	(2,051)	(706)	(3,790)	(2,362)	(3,453)	(3,186)	(1,908)	(9,103)	(10,909)	(16,342)
Net income	2,082	6,724	5,924	5,290	5,202	17,264	16,133	8,257	20,020	46,856	49,822
Less: net income attributable to non-controlling interest	791	3,171	2,435	2,659	2,314	8,091	7,563	3,848	9,056	21,816	22,939
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
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock
Basic									$ 0.60	$ 1.41	$ 1.52
Diluted									0.60	1.40	1.51
Common Class A
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
Diluted	$ 0.07	$ 0.19	$ 0.19	$ 0.15	$ 0.16	$ 0.51	$ 0.48	$ 0.25	$ 0.60	$ 1.40	$ 1.51
Weighted average shares of Class A common stock outstanding
Basic	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
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