Non-controlling Interest - Net income reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Minority Interest [Line Items]
Income (loss) before provision for income taxes attributable to RE/MAX Holdings, Inc.	$ (13,424)	$ 17,588	$ 34,163
Income (loss) before provision for income taxes: Non-controlling interest	(8,737)	12,120	24,133
Income (loss) before provision for income taxes	(22,161)	29,708	58,296
(Provision)/benefit for income taxes attributable to RE/MAX Holdings, Inc.	(2,192)	(6,338)	(8,883)
(Provision)/benefit for income taxes: Non-controlling interest	(267)	(2,824)	(2,099)
(Provision)/benefit for income taxes	(2,459)	(9,162)	(10,982)
Net income (loss) attributable to RE/MAX Holdings, Inc.	(15,616)	11,250	25,280
Net income (loss): Non-controlling interest	(9,004)	9,296	22,034
Net income (loss)	$ (24,620)	$ 20,546	$ 47,314
RMCO, LLC
Minority Interest [Line Items]
Weighted average ownership percentage	100.00%	100.00%
RMCO, LLC | Weighted Average
Minority Interest [Line Items]
Weighted average ownership percentage attributable to RE/MAX Holdings, Inc.	59.80%	59.10%	58.60%
Weighted average ownership percentage	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%	41.40%