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Fair Value Measurements Notional Amount of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Notional Disclosures [Abstract] |  |
Best efforts contracts and related committed IRLCs | $ 3,289 mho_NotionalAmountOfBestEffortContractsAndRelatedCommittedInterestRateLockCommitments | $ 3,072 mho_NotionalAmountOfBestEffortContractsAndRelatedCommittedInterestRateLockCommitments
Uncommitted IRLCs | 47,236 mho_NotionalAmountOfUncommittedInterestRateLockCommitments | 28,028 mho_NotionalAmountOfUncommittedInterestRateLockCommitments
FMBSs related to uncommitted IRLCs | 47,000 mho_ForwardSalesOfMortgageBackedSecuritiesRelatedToUncommittedInterestRateLockCommitments | 41,000 mho_ForwardSalesOfMortgageBackedSecuritiesRelatedToUncommittedInterestRateLockCommitments
Best efforts contracts and related mortgage loans held for sale | 12,281 mho_BestEffortContractsAndRelatedMortgageLoansHeldForSale | 61,233 mho_BestEffortContractsAndRelatedMortgageLoansHeldForSale
FMBSs related to mortgage loans held for sale | 62,000 mho_ForwardSalesOfMortgageBackedSecuritiesRelatedToMortgageLoansHeldForSale | 27,000 mho_ForwardSalesOfMortgageBackedSecuritiesRelatedToMortgageLoansHeldForSale
Mortgage loans held for sale covered by FMBSs | $ 61,563 mho_MortgageLoansHeldForSaleCoveredByForwardSalesOfMortgageBackedSecurities | $ 26,825 mho_MortgageLoansHeldForSaleCoveredByForwardSalesOfMortgageBackedSecurities

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- Definition Best Effort Contracts and Related Mortgage Loans Held for Sale + References No definition available. + Details
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- Definition Forward Sales of Mortgage-Backed Securities Related to Mortgage Loans Held for Sale + References No definition available. + Details
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- Definition Forward Sales of Mortgage-Backed Securities related to Uncommitted Interest Rate Lock Commitments + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Mortgage Loans Held for Sale Covered by Forward Sales of Mortgage-Backed Securities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Notional Amount of Best Effort Contracts and Related Committed Interest Rate Lock Commitments + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notional Amount of Uncommitted Interest Rate Lock Commitments + References No definition available. + Details
Name: | mho_NotionalAmountOfUncommittedInterestRateLockCommitments
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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