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Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Award Limitations - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
Incentive_Plan
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| 2013 Omnibus Equity Incentive Plan [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Number of active equity plans |
1mmi_NumberOfActiveEquityPlans / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
| Common stock shares reserved for issuance of awards |
5,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
| Common stock shares available for grant |
3,297,829us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
| Common stock available for future issuance authorized annual percentage increase |
3.00%mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfAvailableShareIncrease / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
| Increase of common stock share reserve approved |
1,100,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableShareIncrease / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
| Options & SARs [Member] | Minimum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
500,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = mmi_OptionsAndStockAppreciationRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Options & SARs [Member] | Maximum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
1,000,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = mmi_OptionsAndStockAppreciationRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Restricted Stock and RSUs [Member] | Minimum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
500,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = mmi_RestrictedStockAndRsuMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Restricted Stock and RSUs [Member] | Maximum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
1,000,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = mmi_RestrictedStockAndRsuMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Performance Shares [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Number of award limitation, performance units or performance shares |
1mmi_NumberOfAwardLimitationPerformanceUnitsOrPerformanceShares / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
| Performance Shares [Member] | Minimum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
500,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Grant date fair value limitations to awards granted under the 2013 Plan |
2mmi_PerformanceUnitsAndPerformanceSharesGrantsInPeriodFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Performance Shares [Member] | Maximum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share limitations to awards granted under the 2013 Plan |
1,000,000mmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLimitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Grant date fair value limitations to awards granted under the 2013 Plan |
5mmi_PerformanceUnitsAndPerformanceSharesGrantsInPeriodFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Number Of Active Equity Plans No definition available.
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Number of award limitation, performance units or performance shares for a performance period. No definition available.
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- Definition
Performance units and performance shares grants in period fair value. No definition available.
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- Definition
Annual share increase in share reserve allowed under the 2013 Plan. No definition available.
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- Definition
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Limited In Period, Including Aggregate Share Limit Increase. No definition available.
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- Definition
Percentage of available share increase in share reserve allowed under the 2013 Equity and 2013 ESPP plans, calculated as a percentage of outstanding shares. No definition available.
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- Definition
Aggregate number of common shares reserved for future issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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