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Stock-Based Compensation Plans - Amendments to Restricted Stock and SARs - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2015 Age
Deferred stock units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
DSU settlement to common stock percentage | 20.00%mmi_DeferredStockUnitsSettlementToCommonStockPercentage / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember
DSU settlement into actual stock issued term | 5 years
Employee termination age | 67 mmi_EmployeeTerminationAge / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember
Percentage of deferred stock units settled | 100.00%mmi_PercentageOfDeferredStockUnitsSettled / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember
Percentage of shares of deferred stock units released from resale restriction in the event of death or termination after reaching age 67 | 100.00%mmi_PercentageOfSharesOfDeferredStockUnitsReleasedFromResaleRestriction / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember
Restricted Stock [Member] | Sales Restricted [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Sales restriction lapse percentage for restricted stock | 20.00%mmi_RestrictedCommonStockSaleRestrictionLapsePercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mmi_SalesRestrictedMember
Sales restriction period for restricted stock | 5 years
Employee termination age | 67 mmi_EmployeeTerminationAge / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mmi_SalesRestrictedMember
Percentage of shares of stock released from resale restriction upon consummation of change of control | 100.00%mmi_PercentageOfSharesOfCommonStockReleasedFromResaleRestrictionOnChangeOfControl / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mmi_SalesRestrictedMember
Percentage of shares of restricted released from resale restriction in the event of death or termination after reaching age 67 | 100.00%mmi_PercentageOfSharesOfRestrictedReleasedFromResaleRestrictionInEventOfDeathOrTerminationAfterReachingAgeSixtySeven / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mmi_SalesRestrictedMember

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- Definition Settlement of DSUs to actual common stock percentage + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Settlement of DSUs to actual common stock term. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Employee Termination Age + References No definition available. + Details
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Namespace Prefix: | mmi_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of deferred stock units settled in the event of death or employment termination after reaching the age of 67. + References No definition available. + Details
Name: | mmi_PercentageOfDeferredStockUnitsSettled
Namespace Prefix: | mmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Shares Of Common Stock Released From Resale Restriction on Change of Control + References No definition available. + Details
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Namespace Prefix: | mmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of shares of deferred stock units released from resale restriction in the event of death or employment termination after reaching the age of 67. + References No definition available. + Details
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Namespace Prefix: | mmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of shares of restricted released from resale restriction in the event of death or termination after reaching age 67. + References No definition available. + Details
Name: | mmi_PercentageOfSharesOfRestrictedReleasedFromResaleRestrictionInEventOfDeathOrTerminationAfterReachingAgeSixtySeven
Namespace Prefix: | mmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted common stock sales restriction lapse percentage. + References No definition available. + Details
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Namespace Prefix: | mmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted common stock sales restriction period. + References No definition available. + Details
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Namespace Prefix: | mmi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |