Business and Organization (Details)			3 Months Ended		12 Months Ended
	Oct. 07, 2013 $ / shares shares	Oct. 01, 2013	Mar. 31, 2016 item	Dec. 31, 2015 $ / shares shares	Dec. 31, 2016 region country Office item
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of agents | item					110,000
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 brokerages having assets and liabilities sold | item			21
Stock split, conversion ratio		25
Number of independent regions acquired | region					6
RMCO, LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Parent economic interest in RMCO (as a percent)	39.56%			58.33%	58.43%
RMCO, LLC | RIHI
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Redemption of common membership units (in units)				5,175,000
Common Class A
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock at public offering price per share | $ / shares				$ 36.00
Common Class A | IPO
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Issuance of Class A common stock, net of underwriters discount and expenses, shares	11,500,000
Common stock at public offering price per share | $ / shares	$ 22.00
Common Class A | RIHI | Secondary Offering
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Issuance of Class A common stock, net of underwriters discount and expenses, shares				5,175,000
Common Class A | RMCO, LLC
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Stock split, conversion ratio				1