Business and Organization (Details)	3 Months Ended
	Mar. 31, 2020 country Office item	Dec. 31, 2019
RMCO, LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Parent economic interest in RMCO (as a percent)	59.10%	58.70%
Non-controlling interest ownership of common units in RMCO as a percentage	40.90%	41.30%
Minimum
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of agents | item	130,000
Number of offices | Office	8,000
Number of countries in which entity operates | country	110
REMAX
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Percentage of Company consisting of franchises	100.00%