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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cost charges	$ 3,813	$ 3,532	$ 13,477	$ 10,209
Technology development - operating
Cost charges	2,721	1,523	9,414	3,687
Technology development - capital
Cost charges	104	1,420	864	3,884
Marketing staff and administrative services
Cost charges	$ 988	$ 589	$ 3,199	$ 2,638