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Fair Value Measurements Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 36,098 mho_TotalCashCashEquivalentsAndRestrictedCash / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 22,486 mho_TotalCashCashEquivalentsAndRestrictedCash / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Mortgage loans held for sale | 79,180 mho_MortgageLoansHeldForSale / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 92,794 mho_MortgageLoansHeldForSale / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Split dollar life insurance policies | 202 mho_SplitDollarLifeInsurancePolicies / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 187 mho_SplitDollarLifeInsurancePolicies / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Notes receivable | 3,765 us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 4,288 us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Commitments to extend real estate loans (assets) | 634 mho_InterestRateLockCommitmentsFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 289 mho_InterestRateLockCommitmentsFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 58 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 90,000 mho_NotesPayableHomebuildingFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 30,000 mho_NotesPayableHomebuildingFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Notes Payable - Financial Services Fair Value Disclosure | 71,723 mho_NotesPayableFinancialServicesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 85,379 mho_NotesPayableFinancialServicesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Notes payable - other | 8,876 mho_OtherLoansPayableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 9,518 mho_OtherLoansPayableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Convertible senior subordinated notes due 2017 - Fair Value Disclosure | 57,500 mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 57,500 mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Convertible senior subordinated notes due 2018 - Fair Value Disclosure | 86,250 mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 86,250 mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Senior notes | 228,569 mho_SeniorNotesFairValueDisclosures / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 228,469 mho_SeniorNotesFairValueDisclosures / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 107 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 0 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Forward sales of mortgage-backed securities | 562 mho_ForwardContractsFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 182 mho_ForwardContractsFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Off-Balance Sheet Letters of Credit | 0 mho_OffBalanceSheetLettersofCredit / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 0 mho_OffBalanceSheetLettersofCredit / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 36,098 mho_TotalCashCashEquivalentsAndRestrictedCash / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 22,486 mho_TotalCashCashEquivalentsAndRestrictedCash / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Mortgage loans held for sale | 79,180 mho_MortgageLoansHeldForSale / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 92,794 mho_MortgageLoansHeldForSale / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Split dollar life insurance policies | 202 mho_SplitDollarLifeInsurancePolicies / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 187 mho_SplitDollarLifeInsurancePolicies / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Notes receivable | 3,454 us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 3,793 us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Commitments to extend real estate loans (assets) | 634 mho_InterestRateLockCommitmentsFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 289 mho_InterestRateLockCommitmentsFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 58 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 90,000 mho_NotesPayableHomebuildingFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 30,000 mho_NotesPayableHomebuildingFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Notes Payable - Financial Services Fair Value Disclosure | 71,723 mho_NotesPayableFinancialServicesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 85,379 mho_NotesPayableFinancialServicesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Notes payable - other | 8,644 mho_OtherLoansPayableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 9,089 mho_OtherLoansPayableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Convertible senior subordinated notes due 2017 - Fair Value Disclosure | 67,634 mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 67,634 mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Convertible senior subordinated notes due 2018 - Fair Value Disclosure | 87,328 mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 87,544 mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Senior notes | 238,625 mho_SeniorNotesFairValueDisclosures / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 239,488 mho_SeniorNotesFairValueDisclosures / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 107 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 0 mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Forward sales of mortgage-backed securities | 562 mho_ForwardContractsFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 182 mho_ForwardContractsFairValueDisclosuresLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Off-Balance Sheet Letters of Credit | $ 646 mho_OffBalanceSheetLettersofCredit / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 881 mho_OffBalanceSheetLettersofCredit / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

X
- Definition Best Efforts Contracts for Committed Interest Rate Lock Commitments and Mortgage Loans Held for Sale - Fair Value Disclosures (Assets) + References No definition available. + Details
Name: | mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresAssets
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of best efforts contracts for committed interest rate lock commitments and mortgage loans held for sale as of the balance sheet date. + References No definition available. + Details
Name: | mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Convertible senior subordinated notes due 2017 - fair value disclosure + References No definition available. + Details
Name: | mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Convertible senior subordinated notes due 2018 - Fair Value Disclosure + References No definition available. + Details
Name: | mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Forward sales of mortgage-backed securities - fair value disclosures (liabilities) + References No definition available. + Details
Name: | mho_ForwardContractsFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Interest Rate Lock Commitments - Fair Value Disclosures (Assets) + References No definition available. + Details
Name: | mho_InterestRateLockCommitmentsFairValueDisclosuresAssets
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Mortgage Loans Held For Sale + References No definition available. + Details
Name: | mho_MortgageLoansHeldForSale
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notes Payable - Financial Services Fair Value Disclosure + References No definition available. + Details
Name: | mho_NotesPayableFinancialServicesFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Notes Payable - Homebuilding + References No definition available. + Details
Name: | mho_NotesPayableHomebuildingFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Off-Balance Sheet Letters of Credit + References No definition available. + Details
Name: | mho_OffBalanceSheetLettersofCredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, this element represents the loans payable which were initially due after one year or beyond the operating cycle, if longer, and which are not otherwise defined in the taxonomy. + References No definition available. + Details
Name: | mho_OtherLoansPayableFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Senior Notes - Fair Value Disclosures + References No definition available. + Details
Name: | mho_SeniorNotesFairValueDisclosures
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Split dollar life insurance policies - amount as of the balance sheet date which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References No definition available. + Details
Name: | mho_SplitDollarLifeInsurancePolicies
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total Cash, Cash Equivalents and Restricted Cash + References No definition available. + Details
Name: | mho_TotalCashCashEquivalentsAndRestrictedCash
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |