Quarterly Financial Information - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information [Line Items]
Total revenue	$ 50,841	$ 54,866	$ 54,277	$ 52,642	$ 48,510	$ 49,071	$ 48,727	$ 47,406	$ 212,626	$ 193,714	$ 175,642
Total operating expenses	29,428	33,059	33,363	38,925	110	36,580	26,055	32,637	134,775	95,382	104,309
Operating income	21,413	21,807	20,914	13,717	48,400	12,491	22,672	14,769	77,851	98,332	71,333
Total other expenses, net	(2,977)	(2,846)	(3,176)	(2,688)	(2,541)	(2,180)	(2,398)	(2,351)	(11,687)	(9,470)	(9,318)
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
Provision for income taxes	(7,370)	(3,420)	(3,147)	(1,862)	(46,262)	(3,021)	(4,735)	(3,030)	(15,799)	(57,047)	(15,167)
Net income	11,066	15,541	14,591	9,167	(403)	7,290	15,539	9,388	50,365	31,815	46,848
Less: net income attributable to non-controlling interest (note 4)	4,792	7,402	6,943	4,184	5,074	3,573	8,081	4,848	23,321	21,577	24,627
Net income attributable to RE/MAX Holdings, Inc.	$ 6,274	$ 8,139	$ 7,648	$ 4,983	$ (5,477)	$ 3,717	$ 7,458	$ 4,540	$ 27,044	$ 10,238	$ 22,221
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock
Basic	$ 0.35	$ 0.46	$ 0.43	$ 0.28	$ (0.31)	$ 0.21	$ 0.42	$ 0.26	$ 1.52	$ 0.58	$ 1.26
Diluted	$ 0.35	$ 0.46	$ 0.43	$ 0.28	$ (0.31)	$ 0.21	$ 0.42	$ 0.26	$ 1.52	$ 0.58	$ 1.26
Weighted average shares of Class A common stock outstanding
Basic	17,748,745	17,746,184	17,746,042	17,709,095	17,696,991	17,696,991	17,696,842	17,662,842	17,737,649	17,688,533	17,628,741
Diluted	17,771,180	17,771,212	17,769,641	17,762,133	17,747,744	17,737,786	17,723,802	17,716,013	17,767,499	17,731,800	17,677,768
U.S. statutory tax rate									21.00%	35.00%	35.00%
Common Class A
Quarterly Financial Information [Line Items]
Net income attributable to RE/MAX Holdings, Inc.									$ 27,044	$ 10,238	$ 22,221
Net income attributable to RE/MAX Holdings, Inc. per share of Class A common stock
Basic									$ 1.52	$ 0.58	$ 1.26
Diluted									$ 1.52	$ 0.58	$ 1.26
Weighted average shares of Class A common stock outstanding
Basic									17,737,649	17,688,533	17,628,741
Diluted									17,767,499	17,731,800	17,677,768