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Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
1 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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Nov. 30, 2013
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Mar. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock units, vested shares |
175,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
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| Tax benefits from stock-based award activity included in cash flows from financing activities |
$ 4,739us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
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| Tax benefit from stock-based award activity included in additional paid-in capital |
$ 430us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
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$ 4,300us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
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| Stock Based Compensation Expense [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Change in common stock price used for measurement to FMV for RSU awards to independent contractors |
$ 4.23mmi_ChangeInCommonStockPrice
/ us-gaap_AwardTypeAxis
= mmi_StockBasedCompensationExpenseMember
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$ 2.94mmi_ChangeInCommonStockPrice
/ us-gaap_AwardTypeAxis
= mmi_StockBasedCompensationExpenseMember
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| 2013 Omnibus Equity Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock units, vested shares |
175,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Number of common stock shares withheld to pay employee statutory withholding taxes |
21,409us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Description of awards granted under the 2013 Plan |
In November 2013, MMI issued the following deferred stock units ("DSUs") under the 2013 Plan (i) DSUs for an aggregate of 2,192,413 shares granted as replacement awards related to the prior SARs program to the MMREIS managing directors and (ii) DSUs for 83,334 shares granted to the Company's Co-chairman of the board of directors (Mr. Millichap). The DSU's are fully vested and shares will be issued 20% per year.
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| 2013 Omnibus Equity Incentive Plan [Member] | Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares issued under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Number of shares outstanding under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| 2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period for restricted stock awards and restricted stock units |
3 years
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| 2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period for restricted stock awards and restricted stock units |
5 years
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| 2013 Omnibus Equity Incentive Plan [Member] | SARs [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares issued under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Number of shares outstanding under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| 2013 Omnibus Equity Incentive Plan [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares issued under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Number of shares outstanding under compensation plan |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| 2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| DSU's, percentage settled into actual stock |
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20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= mmi_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Fully vested deferred stock units remaining outstanding |
1,820,596mmi_FullyVestedDeferredStockUnitsRemainingOutstanding
/ us-gaap_AwardTypeAxis
= mmi_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| 2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] | MMREIS Managing Directors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Fully vested deferred stock units |
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2,192,413mmi_FullyVestedDeferredStockUnits
/ us-gaap_AwardTypeAxis
= mmi_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
/ us-gaap_TitleOfIndividualAxis
= mmi_MarcusAndMillichapRealEstateInvestmentServicesManagingDirectorsMember
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| 2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] | Millichap [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Fully vested deferred stock units |
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83,334mmi_FullyVestedDeferredStockUnits
/ us-gaap_AwardTypeAxis
= mmi_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
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