Segment Information - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									$ 104,316	$ 102,145	$ 93,789
Gain (loss) on sale or disposition of assets and sublease, net									139	(4,260)	171
Loss on early extinguishment of debt											(2,893)
Equity-based compensation expense									(9,176)	(2,900)	(2,330)
Public offering related expenses											193
Acquisition-related expense									(1,634)	(5,889)	(1,899)
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									1,289	(180)	(100)
Interest income									676	352	160
Interest expense									(12,051)	(9,996)	(8,596)
Depreciation and amortization									(20,678)	(20,512)	(16,094)
Income before provision for income taxes	$ 18,436	$ 18,961	$ 17,738	$ 11,029	$ 45,859	$ 10,311	$ 20,274	$ 12,418	66,164	88,862	62,015
RE/MAX Franchising
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									108,669	105,184	94,717
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA									$ (4,353)	$ (3,039)	$ (928)