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, 2020	Mar. 31, 2019
Cost charges	$ 4,843	$ 2,925
Technology development - operating
Cost charges	2,971	965
Technology development - capital
Cost charges	644	935
Marketing staff and administrative services
Cost charges	$ 1,228	$ 1,025