Summary of Significant Accounting Policies - Leases (Details)	Jun. 30, 2021 lease
Leases
Number of franchisees' leases recognized by the Company	0

Represents the number of franchisees' leases recognized by the Company.

No definition available.

Name:	rmax_FranchiseesOfficeLeasesRecognizedNumber
Namespace Prefix:	rmax_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant