Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 99,634,000		$ 99,634,000		$ 109,140,000
Amortization expense	4,066,000	$ 3,666,000	15,055,000	$ 10,836,000
RE/MAX of New Jersey
Finite Lived Intangible Assets [Line Items]
Reduction in depreciation and amortization	765,000		765,000
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	197,977,000		197,977,000		224,167,000
Accumulated Amortization	(98,343,000)		(98,343,000)		(115,027,000)
Net Balance	99,634,000		$ 99,634,000		109,140,000
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			12 years 1 month 6 days
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	19,555,000		$ 19,555,000		18,809,000
Accumulated Amortization	(10,348,000)		(10,348,000)		(8,998,000)
Net Balance	9,207,000		$ 9,207,000		9,811,000
Other Intangible Assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			7 years 7 months 6 days
Software and Software Development Costs
Finite Lived Intangible Assets [Line Items]
Initial Cost	13,902,000		$ 13,902,000		13,207,000
Accumulated Amortization	(8,177,000)		(8,177,000)		(7,154,000)
Net Balance	5,725,000		$ 5,725,000		6,053,000
Software and Software Development Costs | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 6 months
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	3,153,000		$ 3,153,000		3,102,000
Accumulated Amortization	(1,921,000)		(1,921,000)		(1,782,000)
Net Balance	1,232,000		$ 1,232,000		1,320,000
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			14 years 1 month 6 days
Software Development
Finite Lived Intangible Assets [Line Items]
Software development costs, not yet completed	782,000		$ 782,000		356,000
Non-compete
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,500,000		2,500,000		2,500,000
Accumulated Amortization	(250,000)		(250,000)		(62,000)
Net Balance	$ 2,250,000		$ 2,250,000		$ 2,438,000
Non-compete | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			10 years