Summary of Significant Accounting Policies - Disaggregated revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 68,193	$ 71,541	$ 71,381	$ 71,178	$ 50,841	$ 54,866	$ 54,277	$ 52,642	$ 282,293	$ 212,626	$ 193,714
Company -owned Regions
Disaggregation of Revenue [Line Items]
Total revenue									128,972	133,925	125,092
Independent Regions
Disaggregation of Revenue [Line Items]
Total revenue									44,686	46,289	44,799
Global and Other
Disaggregation of Revenue [Line Items]
Total revenue									25,978	24,290	23,267
RE/MAX Franchising
Disaggregation of Revenue [Line Items]
Total revenue									199,636	204,504	193,158
Motto Franchising
Disaggregation of Revenue [Line Items]
Total revenue									4,542	2,536	556
Total Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue									72,299
Other
Disaggregation of Revenue [Line Items]
Total revenue									5,816	5,586
U.S. | RE/MAX Franchising
Disaggregation of Revenue [Line Items]
Total revenue									164,867	170,496	160,538
U.S. | Total Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue									64,906
Canada | RE/MAX Franchising
Disaggregation of Revenue [Line Items]
Total revenue									23,024	23,771	23,189
Canada | Total Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue									6,559
Global | RE/MAX Franchising
Disaggregation of Revenue [Line Items]
Total revenue									11,745	$ 10,237	$ 9,431
Global | Total Marketing Funds
Disaggregation of Revenue [Line Items]
Total revenue									$ 834