Summary of Significant Accounting Policies - Services Provided to Marketing Funds by RE/MAX Franchising (Details) - Marketing funds - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Costs charged	$ 4,646	$ 4,821	$ 9,544	$ 9,664
Technology - operating
Costs charged	3,233	3,722	6,833	6,693
Technology - capital
Costs charged	224	116	404	760
Marketing staff and administrative services
Costs charged	$ 1,189	$ 983	$ 2,307	$ 2,211