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Stock-Based Compensation Plans - Amendments to Restricted Stock and SARs - Additional Information (Detail)
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3 Months Ended |
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Mar. 31, 2015
Age
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| 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 |
67mmi_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 |
67mmi_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 No definition available.
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- Definition
Settlement of DSUs to actual common stock term. No definition available.
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- Definition
Employee Termination Age No definition available.
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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. No definition available.
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- Definition
Percentage Of Shares Of Common Stock Released From Resale Restriction on Change of Control No definition available.
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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. No definition available.
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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. No definition available.
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- Definition
Restricted common stock sales restriction lapse percentage. No definition available.
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- Definition
Restricted common stock sales restriction period. No definition available.
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- Details
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- Details
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- Details
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