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Selected Balance Sheet Data - Schedule of Other Liabilities (Parenthetical) (Detail) - Accounts payable and other liabilities [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other liabilities [Line Items]
Contingent consideration	$ 1,268	$ 1,353
Deferred consideration current	$ 6,571	$ 6,666

X

- Definition

Total current deferred consideration in connection with business combinations with only contingency to payment being the passage of time.

+ References

No definition available.

+ Details

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X

- Definition

Other liabilities line items.

+ References

No definition available.

+ Details

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Namespace Prefix:	mmi_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

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Namespace Prefix:
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