XML 46 R31.htm IDEA: XBRL DOCUMENT v3.5.0.2

Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Fully depreciated computer software and hardware and furniture, fixtures and equipment write-off	$ 2.7	$ 2.6

X

- Definition

Fully depreciated computer software hardware and furniture fixtures and equipment writeoff.

+ References

No definition available.

+ Details

Name:	mmi_FullyDepreciatedComputerSoftwareHardwareAndFurnitureFixturesAndEquipmentWriteoff
Namespace Prefix:	mmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration