XML 67 R15.htm IDEA: XBRL DOCUMENT
v3.19.3

Notes Payable to Former Stockholders | 9 Months Ended
--- | ---
Sep. 30, 2019
Payables and Accruals [Abstract] |
Notes Payable to Former Stockholders |
8. | Notes Payable to Former Stockholders
In conjunction with the spin-off and IPO, notes payable to certain former stockholders of MMREIS were issued in settlement of restricted stock and SARs awards that were redeemed by MMREIS upon the termination of employment by the former stockholders (the “Notes”). Such Notes had been previously assumed by MMC, and were transferred to the Company. The Notes are unsecured and bear interest at 5% with annual principal and interest installments with a final principal payment due during the second quarter of 2020. During each of the nine months ended September 30, 2019 and 2018, the Company made total payments on the Notes of $1.5 million, including principal and interest.

X
- Definition The entire disclosure for notes payable to former stockholders. + References No definition available. + Details
Name: | mmi_NotesPayableToFormerStockholdersTextBlock
Namespace Prefix: | mmi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration