Immaterial Corrections to Prior Period Financial Statements - Operation Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Immaterial Corrections to Prior Period Financial Statements
Depreciation and amortization	$ 8,582			$ 6,730			$ 22,236	$ 19,154
Operating income (loss)	(37,576)			10,935			(20,368)	31,678
Income (loss) before provision for income taxes	(41,571)			8,895			(28,786)	24,903
Provision for income taxes	792			2,057			1,454	6,584
Net income (loss)	(42,363)	$ 10,360	$ 1,763	6,838	$ 6,043	$ 5,438	(30,240)	18,319
Less: net income (loss) attributable to non-controlling interest	(17,214)			3,221			(11,515)	8,436
Net income (loss) attributable to RE/MAX Holdings, Inc.	$ (25,149)			3,617			$ (18,725)	9,883
Purchase Accounting [Member]
Immaterial Corrections to Prior Period Financial Statements
Depreciation and amortization				6,730				19,154
Operating income (loss)				10,935				31,678
Income (loss) before provision for income taxes				8,895				24,903
Provision for income taxes				(2,057)				(6,584)
Net income (loss)				6,838				18,319
Less: net income (loss) attributable to non-controlling interest				3,221				8,436
Net income (loss) attributable to RE/MAX Holdings, Inc.				3,617				9,883
Previously Reported | Purchase Accounting [Member]
Immaterial Corrections to Prior Period Financial Statements
Depreciation and amortization				6,850				19,572
Operating income (loss)				10,815				31,260
Income (loss) before provision for income taxes				8,775				24,485
Provision for income taxes				(2,051)				(6,547)
Net income (loss)				6,724				17,938
Less: net income (loss) attributable to non-controlling interest				3,171				8,265
Net income (loss) attributable to RE/MAX Holdings, Inc.				$ 3,553				$ 9,673
Common Class A
Immaterial Corrections to Prior Period Financial Statements
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, basic	$ (1.34)			$ 0.20			$ (1.00)	$ 0.55
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, diluted	$ (1.34)			0.20			$ (1.00)	0.54
Common Class A | Purchase Accounting [Member]
Immaterial Corrections to Prior Period Financial Statements
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, basic				0.20				0.55
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, diluted				0.20				0.54
Common Class A | Previously Reported | Purchase Accounting [Member]
Immaterial Corrections to Prior Period Financial Statements
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, basic				0.20				0.53
Net income (loss) attributable to RE/MAX Holdings, Inc. per share of Class A common stock, diluted				$ 0.19				$ 0.53