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Selected Balance Sheet Data - Additional Information (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 12 Months Ended | |||
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Jan. 01, 2015
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Jan. 01, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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Mar. 31, 2013
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| Schedule Of Accrued Expenses [Line Items] | ||||||
| SARs frozen liability amount | $ 20,756,000mmi_StockAppreciationRightsLiability | $ 20,542,000mmi_StockAppreciationRightsLiability | ||||
| Interest expense | 583,000us-gaap_InterestExpense | 404,000us-gaap_InterestExpense | ||||
| Maximum payment deferral period for certain commissions payable | 3 years | |||||
| Fair value of deferred compensation plan assets | 110.00%mmi_DeferredCompensationPlanPercentage | |||||
| Net change in carrying value of investments held in rabbi trust | 115,000mmi_RecognizedGainsLossesOfInvestmentsHeldInRabbiTrust | 71,000mmi_RecognizedGainsLossesOfInvestmentsHeldInRabbiTrust | ||||
| Net change in carrying value of deferred compensation obligation related to rabbi trust | 154,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | 77,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | ||||
| SARs [Member] | ||||||
| Schedule Of Accrued Expenses [Line Items] | ||||||
| SARs frozen liability amount |
20,000,000mmi_StockAppreciationRightsLiability / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
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| SARs liability frozen value date | Mar. 31, 2013 | |||||
| SARs liability interest accrual commencement date | Jan. 01, 2014 | |||||
| Interest expense |
214,000us-gaap_InterestExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
251,000us-gaap_InterestExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
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| Treasury note term | 10 years | |||||
| Base spread on SARs liability variable rate |
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
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| SARs liability interest accrual rate |
4.173%mmi_StockAppreciationRightsLiabilityInterestAccrualRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
5.03%mmi_StockAppreciationRightsLiabilityInterestAccrualRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
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| Stock appreciation rights liability distribution |
$ 412,000mmi_DistributionRelatedToStockAppreciationRightsLiabilityForTaxesPayable / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
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- Definition
Maximum payment deferral period for certain commissions payable. No definition available.
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| X | ||||||||||
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- Definition
The amount the Company may, in its sole and absolute discretion, elect to withdraw at any time all or a portion of the amount by which the fair market value of the Deferred Compensation Plan's assets exceeds the stated percentage of the aggregate amount credited to the Deferred Compensation Plan's participants' accounts. No definition available.
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| X | ||||||||||
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- Definition
Distribution related to stock appreciation rights liability for FICA taxes payable. No definition available.
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| X | ||||||||||
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- Definition
Recognized gains (losses) of investments held in rabbi trust. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate carrying value (includes principal and accrued interest) as of the balance sheet date of deferred compensation associated with Stock Appreciation Rights payable to each participant in installments upon retirement or departure under terms of the agreement. No definition available.
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| X | ||||||||||
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- Definition
SARS liability frozen value date. No definition available.
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| X | ||||||||||
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- Definition
SARS liability interest accrual commencement date No definition available.
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| X | ||||||||||
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- Definition
Interest accrual rate for the outstanding balance on the SARs liability. No definition available.
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| X | ||||||||||
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- Definition
Treasury note term rate used to determine SARs liability interest accrual rate. No definition available.
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| X | ||||||||||
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- Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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| X | ||||||||||
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- Definition
The compensation expense recognized during the period pertaining to the deferred compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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