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Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Balance Sheet Related Disclosures [Abstract] |  |
SARs liability | $ 20,756 mmi_StockAppreciationRightsLiability | $ 20,542 mmi_StockAppreciationRightsLiability
Commissions payable to sales and financing professionals | 8,083 mmi_CommissionsPayableNoncurrent | 12,176 mmi_CommissionsPayableNoncurrent
Deferred compensation liability | 5,209 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent | 3,863 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Total | $ 34,048 mmi_DeferredCompensationAndCommissionsNonCurrent | $ 36,581 mmi_DeferredCompensationAndCommissionsNonCurrent

X
- Definition Deferred commission payable and other noncurrent commission related obligations. + References No definition available. + Details
Name: | mmi_CommissionsPayableNoncurrent
Namespace Prefix: | mmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements related to Rabbi Trust, deferred commissions payable and other commissions related obligations and SARs Liability. + References No definition available. + Details
Name: | mmi_DeferredCompensationAndCommissionsNonCurrent
Namespace Prefix: | mmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate carrying value (includes principal and accrued interest) as of the balance sheet date of deferred compensation associated with Stock Appreciation Rights payable to each participant in installments upon retirement or departure under terms of the agreement. + References No definition available. + Details
Name: | mmi_StockAppreciationRightsLiability
Namespace Prefix: | mmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable after one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant