Acquisitions - Re/Max Integra North America Acquisition (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 21, 2021 USD ($) item state	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Loss on purchase price of pre-existing master franchise agreements | $			$ 40,500
Franchise agreements
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			12 years
Non-compete agreements
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			5 years
RE/MAX INTEGRA North America Region Asset Acquisition
Business Acquisition [Line Items]
Cash consideration | $	$ 235,000
Number of agents | item	19,000
Loss on purchase price of pre-existing master franchise agreements | $	$ 40,500
Incremental revenues since acquisition date | $		$ 11,500	$ 11,500
RE/MAX INTEGRA North America Region Asset Acquisition | Canada
Business Acquisition [Line Items]
Number of provinces | item	5
Number of agents | item	12,000
Percentage of goodwill	50.00%
RE/MAX INTEGRA North America Region Asset Acquisition | U.S.
Business Acquisition [Line Items]
Number of states | state	9
Number of agents | item	7,000
Percentage of goodwill	0.00%