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Stock-Based Compensation Plans - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $)
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1 Months Ended |
12 Months Ended |
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Nov. 30, 2014
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Dec. 31, 2014
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares outstanding under compensation plan |
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750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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3,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Stock Based Compensation Expense [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock price used for measurement to FMV for RSU awards to independent contractors |
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33.25us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= mmi_StockBasedCompensationExpenseMember
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$ 14.90us-gaap_SharePrice
/ 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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| Deferred stock units, number of shares settled |
455,151mmi_StockIssuedDuringPeriodSharesDeferredStockUnitsBeforeTaxSettlement
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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| Number of common stock shares withheld to pay employee statutory withholding taxes |
185,821us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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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| Fully vested deferred stock units remaining outstanding |
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1,820,596mmi_FullyVestedDeferredStockUnitsRemainingOutstanding
/ us-gaap_AwardTypeAxis
= mmi_DeferredStockUnitsMember
/ us-gaap_PlanNameAxis
= mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember
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