The amount of additional mandatory commitment reduction required if certain debt covenants are not achieved.

No definition available.

Name:	rmax_AdditionalMandatoryCommitmentReductionUnderDebtCovenantRequirement
Namespace Prefix:	rmax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of additional mandatory prepayment required if certain debt covenants are not achieved.

+ References

No definition available.

+ Details

Name:	rmax_AdditionalMandatoryPrepaymentUnderDebtCovenantRequirement
Namespace Prefix:	rmax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the ratio of consolidated total debt to consolidated adjusted earnings before, interest, taxes, depreciation and amortization allowed under the terms of the senior secured credit facilities' covenants.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmax_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for first periodic payment from current period.

+ References

No definition available.

+ Details

Name:	rmax_DebtInstrumentFirstPeriodicPaymentFromCurrentPeriod
Namespace Prefix:	rmax_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of debt issuance costs incurred during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents percentage of excess cash flow that must be used to repay term loans if total leverage ratio exceeds specified amount.

+ References

No definition available.

+ Details

Name:	rmax_ExcessCashFlowRepayment
Namespace Prefix:	rmax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of additional debt incurred not permitted by the 2016 Senior Secured Credit facility that is required to be used to repay term loans and reduce revolving commitments.

+ References

No definition available.

+ Details

Name:	rmax_LongTermDebtPercentageOfProceedsOfAdditionalDebtIncurredNotPermittedByCreditFacilityRequiredToRepayTermLoans
Namespace Prefix:	rmax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of asset sales required to repay term loans and reduce revolving commitments.

+ References

No definition available.

+ Details

Name:	rmax_LongTermDebtPercentageOfProceedsOfAssetsSalesRequiredToRepayTermLoansAndReduceRevolvingCommitments
Namespace Prefix:	rmax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of insurance recoveries required to repay term loans and reduce revolving commitments.

+ References

No definition available.

+ Details

Name:	rmax_PercentageOfAmountsRecoveredUnderInsurancePoliciesRequiredToRepayTermLoansAndReduceRevolvingCommitments
Namespace Prefix:	rmax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-SubTopic 10
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=rmax_SeniorSecuredCreditFacilityDatedAsOf31July2013Member
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- Details

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- Details

Name:	srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfNewYorkMember
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- Details

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- Details

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- Details

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Debt - Additional Information (Details) $ in Millions	12 Months Ended
Debt - Additional Information (Details) $ in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 15, 2016 USD ($)	Jul. 31, 2013 USD ($)
Debt Instrument [Line Items]
Excess cash flow payment		$ 12.7
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Excess cash flow repayment (as a percent)		50.00%
Leverage ratio under debt covenant		2.50
Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt issuance costs incurred		$ 3.5
Debt Instrument, expense incurred		2.1
Excess cash flow repayment (as a percent)	50.00%
Leverage ratio under debt covenant	3.25
Percentage of proceeds of additional debt incurred not permitted by credit facility required to repay term loans	100.00%
Percentage of proceeds of assets sales required to repay term loans and reduce revolving commitments	100.00%
Percentage of amounts recovered under insurance policies required to repay term loans and reduce revolving commitments	100.00%
First periodic payment from current period	12 months
Additional mandatory prepayment if total leverage ratio is not achieved	$ 0.0
Additional mandatory commitment reduction if total leverage ratio is not achieved	$ 0.0
Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Leverage ratio under debt covenant	2.75
Senior Secured Credit Facility \| Federal Reserve Bank of New York
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Senior Secured Credit Facility \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Debt Net Of Current Portion \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt issuance costs incurred		$ 1.4
Term loan \| 2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 230.0
Term loan \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Notes Payable to Bank			$ 235.0
Revolving loan facility
Debt Instrument [Line Items]
Revolving loan facility commitment fee on average daily amount of unused portion	0.50%
Amounts drawn on line of credit	$ 0.0
Revolving loan facility \| 2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 10.0
Revolving loan facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity			$ 10.0
ABR loans \| Senior Secured Credit Facility \| Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%