Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 26, 2018	Nov. 15, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Purchase Price Allocation
Increase (Decrease) to goodwill					$ 700
Increase in depreciation and amortization expense			$ 400		400
Goodwill			150,859		150,859		$ 135,213
Acquisition- related expense			141	$ 3,566	1,628	$ 4,398
Pro Forma Information
Total revenue			54,866	52,144	163,051	154,241
Net income attributable to RE/MAX Holdings, Inc.			$ 8,139	$ 2,950	$ 20,078	$ 13,842
Basic earnings per common share			$ 0.46	$ 0.17	$ 1.13	$ 0.78
Diluted earnings per common share			$ 0.46	$ 0.17	$ 1.13	$ 0.78
Booj Llc
Business Acquisition [Line Items]
Cash consideration	$ 26,300
Issuance of Class A common stock, equity-based compensation plans, value	10,000
Purchase Price Allocation
Increase (Decrease) to goodwill			$ (3,600)
Increase to other intangible assets			3,600
Increase in depreciation and amortization expense			$ 400
Cash	362
Other current assets	367
Property and equipment	625
Software	7,400
Trademarks	500
Non-compete agreement	1,200
Customer relationships	800
Other assets, net of current portion	336
Total assets acquired, excluding goodwill	13,179
Current portion of debt	(606)
Other current liabilities	(557)
Debt, net of current portion	(805)
Total liabilities assumed	(1,968)
Goodwill	15,039
Total purchase price	26,250
Remax Of Northern Illinois Inc
Business Acquisition [Line Items]
Cash consideration		$ 35,700
Purchase Price Allocation
Decrease to franchise agreements, net					$ (700)
Increase (Decrease) to goodwill					$ 700
Goodwill		12,920
Total purchase price		35,720
Franchise agreements | Remax Of Northern Illinois Inc
Purchase Price Allocation
Other intangible assets		$ 22,800
Other intangible assets | Booj Llc
Purchase Price Allocation
Other intangible assets	$ 1,589