Summary of Significant Accounting Policies - Services Provided to Marketing Funds by RE/MAX Franchising (Details) - Marketing funds - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Costs charged	$ 5,181	$ 3,813	$ 14,725	$ 13,477
Technology - operating
Costs charged	3,213	2,721	10,046	9,414
Technology - capital
Costs charged	243	104	647	864
Marketing staff and administrative services
Costs charged	$ 1,725	$ 988	$ 4,032	$ 3,199