Summary of Significant Accounting Policies - Schedule of Deferred Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Annual dues
Disaggregation of Revenue [Line Items]
Deferred revenue recognition period	12 months
Balance at beginning of period	$ 15,982
New billings	33,632
Revenue recognized	(35,075)
Balance at the end of period	14,539
Annual dues
Disaggregation of Revenue [Line Items]
Revenue recognized	14,100
Franchise sales
Disaggregation of Revenue [Line Items]
Balance at beginning of period	25,884
New billings	8,615
Revenue recognized	(9,430)
Balance at the end of period	25,069
Revenue recognized	$ 8,400
Franchise sales | RE/MAX franchise agreements
Disaggregation of Revenue [Line Items]
Period of franchise agreement	5 years
Franchise sales | Motto Franchising
Disaggregation of Revenue [Line Items]
Period of franchise agreement	7 years