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Debt MIF Warehousing Agreement (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Maximum Borrowing Availability under all Credit Lines | $ 125,000,000 mho_MaximumBorrowingAvailabilityUnderAllCreditLines |
Notes payable bank - financial service operations | 71,723,000 us-gaap_WarehouseAgreementBorrowings | 85,379,000 us-gaap_WarehouseAgreementBorrowings
Warehousing Agreement - First Amendment to Amended and Restated [Member] |  |
Debt Instrument [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | 110,000,000 mho_MIFinancialMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Optional increase in borrowing availability | 20,000,000 mho_Optionalincreaseinborrowingavailability / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Aggreate Maximum Principal Amount Permitted to be Outstanding Under All Warehousing Credit Lines | 150,000,000 mho_AggreateMaximumPrincipalAmountPermittedToBeOutstandingUnderAllWarehousingCreditLines / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Minimum Net Worth Required for Compliance | 11,000,000 us-gaap_MinimumNetWorthRequiredForCompliance / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Minimum required liquidity for compliance | 5,500,000 mho_Minimumrequiredliquidityforcompliance / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
LIBOR basis points | 275 mho_LiborBasisPoints / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Debt Instrument, Basis Spread on Variable Rate | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember |
Repurchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | $ 15,000,000 mho_MIFinancialMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mho_RepurchaseAgreementMember |
Minimum [Member] | Repurchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
LIBOR basis points | 275 mho_LiborBasisPoints / us-gaap_CreditFacilityAxis = mho_RepurchaseAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] | Repurchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
LIBOR basis points | 300 mho_LiborBasisPoints / us-gaap_CreditFacilityAxis = mho_RepurchaseAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Maximum borrowing capacity under all warehousing credit lines permitted to be outstanding at any one time in aggregate. + References No definition available. + Details
Name: | mho_AggreateMaximumPrincipalAmountPermittedToBeOutstandingUnderAllWarehousingCreditLines
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition LIBOR basis points + References No definition available. + Details
Name: | mho_LiborBasisPoints
Namespace Prefix: | mho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum Borrowing Availability under all Credit Lines + References No definition available. + Details
Name: | mho_MaximumBorrowingAvailabilityUnderAllCreditLines
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition M/I Financial Maximum Borrowing Capacity + References No definition available. + Details
Name: | mho_MIFinancialMaximumBorrowingCapacity
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum required liquidity for compliance + References No definition available. + Details
Name: | mho_Minimumrequiredliquidityforcompliance
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Optional increase in borrowing availability + References No definition available. + Details
Name: | mho_Optionalincreaseinborrowingavailability
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(a) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
Name: | us-gaap_MinimumNetWorthRequiredForCompliance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 9 + Details
Name: | us-gaap_WarehouseAgreementBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=mho_RepurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=mho_WarehousingAgreementFirstAmendmenttoAmendedandRestatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |