Non-controlling Interest - Net income reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Minority Interest [Line Items]
Income before provision for income taxes attributable to RE/MAX Holdings, Inc.	$ 6,531		$ 3,895		$ 7,473	$ 9,447
Income before provision for income taxes: Non-controlling interest	4,411		2,735		5,051	6,263
Income before provision for income taxes	10,942		6,630		12,524	15,710
(Provision) benefit for income taxes attributable to RE/MAX Holdings, Inc.	(1,330)		(406)		(1,180)	(3,327)
(Provision) benefit for income taxes: Non-controlling interest	634		(300)		542	(1,169)
(Provision) benefit for income taxes	(696)		(706)		(638)	(4,496)
Net income attributable to RE/MAX Holdings, Inc.	5,201		3,489		6,293	6,120
Net income: Non-controlling interest	5,045		2,435		5,593	5,094
Net income	$ 10,246	$ 1,640	5,924	$ 5,290	$ 11,886	11,214
RMCO, LLC
Minority Interest [Line Items]
Weighted average ownership percentage	100.00%				100.00%		100.00%
Net income attributable to RE/MAX Holdings, Inc.	$ 5,201		$ 3,489		$ 6,293	$ 6,120
RMCO, LLC | Weighted Average
Minority Interest [Line Items]
Weighted average ownership percentage attributable to RE/MAX Holdings, Inc.	59.80%		59.10%		59.70%	59.00%
Weighted average ownership percentage	100.00%		100.00%		100.00%	100.00%
RIHI | RMCO, LLC | Weighted Average
Minority Interest [Line Items]
Weighted average ownership percentage: Non-controlling interest	40.20%		40.90%		40.30%	41.00%