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Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]
SARs liability	$ 1,366	$ 0
Commissions payable to investment sales and financing professionals	28,140	34,091
Deferred compensation liability	138	0
Total	29,644	34,091
SARs liability	20,719	21,399
Commissions payable to investment sales and financing professionals	12,755	17,015
Deferred compensation liability	6,804	5,264
Total	$ 40,278	$ 43,678

X

- Definition

Commissions payable current.

+ References

No definition available.

+ Details

Name:	mmi_CommissionsPayableCurrent
Namespace Prefix:	mmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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 current 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_DeferredCompensationAndCommissionsCurrent
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

- Definition

Stock appreciation rights liability current.

+ References

No definition available.

+ Details

Name:	mmi_StockAppreciationRightsLiabilityCurrent
Namespace Prefix:	mmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ 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 within 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19793-108362

+ Details

Name:	us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent
Namespace Prefix:	us-gaap_
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 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