Segment Information - Reconciliation (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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									$ 103,515	$ 104,316	$ 102,145
(Gain) loss on sale or disposition of assets and sublease, net									(342)	139	(4,260)
Equity-based compensation expense									(10,934)	(9,176)	(2,900)
Acquisition-related expense									(1,127)	(1,634)	(5,889)
Gain on reduction in TRA liability										6,145	32,736
Special Committee investigation and remediation expense										(2,862)	(2,634)
Fair value adjustments to contingent consideration									(241)	1,289	(180)
Interest income									1,446	676	352
Interest expense									(12,229)	(12,051)	(9,996)
Depreciation and amortization									(22,323)	(20,678)	(20,512)
Income before provision for income taxes	$ 7,564	$ 20,717	$ 19,319	$ 10,165	$ 18,436	$ 18,961	$ 17,738	$ 11,029	57,765	66,164	88,862
RE/MAX Franchising
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									106,810	108,669	105,184
Motto Franchising
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									(2,709)	(3,436)	$ (3,039)
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									$ (586)	$ (917)