Summary of Significant Accounting Policies - Services Provided to Marketing Funds by RE/MAX Franchising (Details) - Marketing funds - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cost charges	$ 15,102
Technology development - operating
Cost charges	6,244
Technology development - capital
Cost charges	5,095
Marketing staff and administrative services
Cost charges	$ 3,763	$ 3,800	$ 3,400