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Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2013 | Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units, vested shares | 175,122 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod |  |  |
Tax benefits from stock-based award activity included in cash flows from financing activities | $ 4,739 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |
Tax benefit from stock-based award activity included in additional paid-in capital | $ 430 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | $ 4,300 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |
Stock Based Compensation Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Change in common stock price used for measurement to FMV for RSU awards to independent contractors | $ 4.23 mmi_ChangeInCommonStockPrice / us-gaap_AwardTypeAxis = mmi_StockBasedCompensationExpenseMember |  |  | $ 2.94 mmi_ChangeInCommonStockPrice / us-gaap_AwardTypeAxis = mmi_StockBasedCompensationExpenseMember
2013 Omnibus Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units, vested shares | 175,122 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
Number of common stock shares withheld to pay employee statutory withholding taxes | 21,409 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
Description of awards granted under the 2013 Plan | In November 2013, MMI issued the following deferred stock units ("DSUs") under the 2013 Plan (i) DSUs for an aggregate of 2,192,413 shares granted as replacement awards related to the prior SARs program to the MMREIS managing directors and (ii) DSUs for 83,334 shares granted to the Company's Co-chairman of the board of directors (Mr. Millichap). The DSU's are fully vested and shares will be issued 20% per year. |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
Number of shares outstanding under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period for restricted stock awards and restricted stock units | 3 years |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period for restricted stock awards and restricted stock units | 5 years |  |  |
2013 Omnibus Equity Incentive Plan [Member] | SARs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
Number of shares outstanding under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
Number of shares outstanding under compensation plan | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
DSU's, percentage settled into actual stock |  |  | 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |
Fully vested deferred stock units remaining outstanding | 1,820,596 mmi_FullyVestedDeferredStockUnitsRemainingOutstanding / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember |  |  |
2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] | MMREIS Managing Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fully vested deferred stock units |  |  | 2,192,413 mmi_FullyVestedDeferredStockUnits / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember / us-gaap_TitleOfIndividualAxis = mmi_MarcusAndMillichapRealEstateInvestmentServicesManagingDirectorsMember |
2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member] | Millichap [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fully vested deferred stock units |  |  | 83,334 mmi_FullyVestedDeferredStockUnits / us-gaap_AwardTypeAxis = mmi_DeferredStockUnitsMember / us-gaap_PlanNameAxis = mmi_TwoThousandAndThirteenOmnibusEquityAwardPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_BoardOfDirectorsChairmanMember |

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- Definition Change in common stock price used for measurement to FMV for RSU awards to independent contractors. + References No definition available. + Details
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- Definition Fully vested deferred stock units that will be settled into actual common stock at a year rate of 20% per year as specified in the terms per the agreement. + References No definition available. + Details
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- Definition Fully vested deferred stock units remaining outstanding. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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