Business and Organization (Details)	9 Months Ended
	Sep. 30, 2017 segment country Office item	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of agents | item	115,000
Number of offices | Office	7,000
Number of countries in which entity operates | country	100
Percentage of Company consisting of franchises	100.00%
Number Of Reportable Segments | segment	1
RMCO, LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Parent economic interest in RMCO (as a percent)	58.49%	58.43%
Non-controlling unitholders ownership of common units in RMCO as a percentage	41.51%	41.57%
RIHI | RMCO, LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Non-controlling unitholders ownership of common units in RMCO as a percentage	41.51%