Summary of Significant Accounting Policies - Services Provided to Marketing Funds by RE/MAX Franchising (Details) - Marketing funds - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cost charges	$ 4,898	$ 4,843
Technology - operating
Cost charges	3,600	2,971
Technology - capital
Cost charges	180	644
Marketing staff and administrative services
Cost charges	$ 1,118	$ 1,228