Non-controlling Interest - Net income reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Minority Interest [Line Items]
Income before provision for income taxes - parent	$ 942	$ 5,552
Income before provision for income taxes: Non-controlling interest	640	3,528
Income before provision for income taxes	1,582	9,080
Provision for income taxes attributable to RE/MAX Holdings, Inc.	150	(2,921)
Provision for income taxes: Non-controlling interest	(92)	(869)
Provision for income taxes	58	(3,790)
Net income attributable to RE/MAX Holdings, Inc.	1,092	2,631
Net income: Non-controlling interest	548	2,659
Net income	$ 1,640	5,290
RMCO, LLC
Minority Interest [Line Items]
Parent economic interest in RMCO (as a percentage)	59.80%		59.40%
Net income attributable to RE/MAX Holdings, Inc.	$ 1,092	$ 2,631
RMCO, LLC | Weighted Average
Minority Interest [Line Items]
Parent economic interest in RMCO (as a percentage)	59.60%	58.90%
Total (as a percentage)	100.00%	100.00%
RIHI | RMCO, LLC
Minority Interest [Line Items]
Weighted average ownership of non-controlling interest (as a percentage)	40.20%		40.60%
RIHI | RMCO, LLC | Weighted Average
Minority Interest [Line Items]
Weighted average ownership of non-controlling interest (as a percentage)	40.40%	41.10%