XML 58 R49.htm IDEA: XBRL DOCUMENT
v3.23.1

Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Assets |  |  |  |
Assets held in rabbi trust | $ 9,953 | $ 9,553 |  |
Marketable debt securities, available-for-sale | 203,013 | 322,029 |  |
Liabilities: |  |  |  |
Contingent consideration | 7,043 |  | $ 9,363 |
Deferred consideration | 3,833 | 5,119 |  |
Deferred compensation liability | 7,718 | 6,661 |  |
Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 132,520 | 253,434 |  |
Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 70,493 | 68,595 |  |
U.S. treasuries | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 56,439 | 134,549 |  |
U.S. treasuries | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 17,582 | 20,715 |  |
U.S. government sponsored entities | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 530 | 536 |  |
Corporate debt | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 75,843 | 118,041 |  |
Corporate debt | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 43,573 | 41,358 |  |
ABS and other | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 238 | 844 |  |
ABS and other | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 8,808 | 5,986 |  |
Recurring |  |  |  |
Assets |  |  |  |
Cash equivalents | 174,566 | 180,349 |  |
Recurring | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 132,520 | 253,434 |  |
Recurring | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 70,493 | 68,595 |  |
Recurring | Commercial paper |  |  |  |
Assets |  |  |  |
Cash equivalents | 39,213 | 41,324 |  |
Recurring | Money market funds |  |  |  |
Assets |  |  |  |
Cash equivalents | 135,353 | 139,025 |  |
Recurring | Assets held in rabbi trust |  |  |  |
Assets |  |  |  |
Assets held in rabbi trust | 9,953 | 9,553 |  |
Recurring | U.S. treasuries | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 56,439 | 134,549 |  |
Recurring | U.S. treasuries | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 17,582 | 20,715 |  |
Recurring | U.S. government sponsored entities | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 530 | 536 |  |
Recurring | Corporate debt | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 75,843 | 118,041 |  |
Recurring | Corporate debt | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 43,573 | 41,358 |  |
Recurring | ABS and other | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 238 | 844 |  |
Recurring | ABS and other | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 8,808 | 5,986 |  |
Level 1 | Recurring |  |  |  |
Assets |  |  |  |
Cash equivalents | 135,353 | 139,025 |  |
Liabilities: |  |  |  |
Deferred consideration | 0 | 0 |  |
Deferred compensation liability | 7,718 | 6,661 |  |
Level 1 | Recurring | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 56,439 | 134,549 |  |
Level 1 | Recurring | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 17,582 | 20,715 |  |
Level 1 | Recurring | Commercial paper |  |  |  |
Assets |  |  |  |
Cash equivalents | 0 | 0 |  |
Level 1 | Recurring | Money market funds |  |  |  |
Assets |  |  |  |
Cash equivalents | 135,353 | 139,025 |  |
Level 1 | Recurring | Assets held in rabbi trust |  |  |  |
Assets |  |  |  |
Assets held in rabbi trust | 0 | 0 |  |
Level 1 | Recurring | U.S. treasuries | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 56,439 | 134,549 |  |
Level 1 | Recurring | U.S. treasuries | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 17,582 | 20,715 |  |
Level 1 | Recurring | U.S. government sponsored entities | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 1 | Recurring | Corporate debt | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 1 | Recurring | Corporate debt | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 1 | Recurring | ABS and other | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 1 | Recurring | ABS and other | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 2 | Recurring |  |  |  |
Assets |  |  |  |
Cash equivalents | 39,213 | 41,324 |  |
Liabilities: |  |  |  |
Deferred consideration | 3,833 | 5,119 |  |
Deferred compensation liability | 0 | 0 |  |
Level 2 | Recurring | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 76,081 | 118,885 |  |
Level 2 | Recurring | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 52,911 | 47,880 |  |
Level 2 | Recurring | Commercial paper |  |  |  |
Assets |  |  |  |
Cash equivalents | 39,213 | 41,324 |  |
Level 2 | Recurring | Money market funds |  |  |  |
Assets |  |  |  |
Cash equivalents | 0 | 0 |  |
Level 2 | Recurring | Assets held in rabbi trust |  |  |  |
Assets |  |  |  |
Assets held in rabbi trust | 9,953 | 9,553 |  |
Level 2 | Recurring | U.S. treasuries | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 2 | Recurring | U.S. treasuries | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 2 | Recurring | U.S. government sponsored entities | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 530 | 536 |  |
Level 2 | Recurring | Corporate debt | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 75,843 | 118,041 |  |
Level 2 | Recurring | Corporate debt | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 43,573 | 41,358 |  |
Level 2 | Recurring | ABS and other | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 238 | 844 |  |
Level 2 | Recurring | ABS and other | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 8,808 | 5,986 |  |
Level 3 | Recurring |  |  |  |
Assets |  |  |  |
Cash equivalents | 0 | 0 |  |
Liabilities: |  |  |  |
Deferred consideration | 0 | 0 |  |
Deferred compensation liability | 0 | 0 |  |
Level 3 | Recurring | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | Commercial paper |  |  |  |
Assets |  |  |  |
Cash equivalents | 0 | 0 |  |
Level 3 | Recurring | Money market funds |  |  |  |
Assets |  |  |  |
Cash equivalents | 0 | 0 |  |
Level 3 | Recurring | Assets held in rabbi trust |  |  |  |
Assets |  |  |  |
Assets held in rabbi trust | 0 | 0 |  |
Level 3 | Recurring | U.S. treasuries | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | U.S. treasuries | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | U.S. government sponsored entities | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | Corporate debt | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | Corporate debt | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | ABS and other | Short-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Level 3 | Recurring | ABS and other | Long-term investments: |  |  |  |
Assets |  |  |  |
Marketable debt securities, available-for-sale | 0 | 0 |  |
Contingent consideration |  |  |  |
Liabilities: |  |  |  |
Contingent consideration | 7,043 | 7,067 |  | $ 9,312
Contingent consideration | Level 1 | Recurring |  |  |  |
Liabilities: |  |  |  |
Contingent consideration | 0 | 0 |  |
Contingent consideration | Level 2 | Recurring |  |  |  |
Liabilities: |  |  |  |
Contingent consideration | 0 | 0 |  |
Contingent consideration | Level 3 |  |  |  |
Liabilities: |  |  |  |
Contingent consideration | $ 7,043 | $ 7,067 |  |

X
- Definition Total current and noncurrent deferred consideration in connection with business combinations with only contingency to payment being the passage of time. + References No definition available. + Details
Name: | mmi_DeferredConsiderationLiabilitiesCurrentNoncurrent
Namespace Prefix: | mmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. 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_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredCompensationPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=mmi_LongTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mmi_InvestmentsHeldInRabbiTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContingentConsiderationByTypeAxis=mmi_ContingentConsiderationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |