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Operating Leases - Schedule of Supplemental Cash Flow Information and Noncash Activity Related to Operating Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating cash flow information:
Cash paid for amounts included in the measurement of operating lease liabilities	$ 5,223	$ 4,842
Noncash activity:
ROU assets obtained in exchange for operating lease liabilities	3,109	3,227
Tenant improvements owned by lessor related to ROU assets	$ 317	$ 1,306

X

- Definition

Cash paid for amounts included in measurement of lease liabilities [Abstract]

+ References

No definition available.

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Balance Type:	na
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- References

No definition available.

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- Definition

Tenant improvements owned by lessor related to right of use asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	mmi_
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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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Balance Type:	credit
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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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Balance Type:	debit
Period Type:	duration