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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Stock Notes Receivable From Employees [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 116,809 us-gaap_StockholdersEquity |  | $ 4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 75,058 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (4)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ReceivablesFromStockholderMember | $ 41,592 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 159 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning Balance, Shares at Dec. 31, 2014 |  |  | 36,918,442 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net and comprehensive income | 14,030 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |  | 13,669 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 361 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Stock-based compensation | 1,907 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  |  | 1,907 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock-based compensation, Shares | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ReceivablesFromStockholderMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Issuance of common stock for vesting of restricted stock units | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_ReceivablesFromStockholderMember | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 mmi_StockIssuedDuringPeriodFairValueOfSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Issuance of common stock for vesting of restricted stock units, Shares |  |  | 175,122 mmi_StockIssuedDuringPeriodSharesRestrictedStockUnitsBeforeTaxSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares withheld related to net share settlement of restricted stock units | (716)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  |  | (716)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Shares withheld related to net share settlement of restricted stock units, Shares |  |  | (21,409)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit from stock-based award activity | 430 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  | 430 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Ending Balance at Mar. 31, 2015 | $ 132,460 us-gaap_StockholdersEquity |  | $ 4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 76,679 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (4)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ReceivablesFromStockholderMember | $ 55,261 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 520 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, Shares at Mar. 31, 2015 |  |  | 37,072,155 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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