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Fair Value Measurements Assets and Liabilities Measured on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Total Fair Value - Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 79,145 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember | $ 92,953 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember
Fair Value, Inputs - Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Significant Other observable Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 79,145 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 92,953 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Mortgage Loans Held for Sale [Member] | Total Fair Value - Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 79,180 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember | 92,794 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember
Mortgage Loans Held for Sale [Member] | Fair Value, Inputs - Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Mortgage Loans Held for Sale [Member] | Fair Value, Significant Other observable Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 79,180 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 92,794 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Mortgage Loans Held for Sale [Member] | Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Forward Sales or Mortgage Backed Securities [Member] | Total Fair Value - Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | (562)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember | (182)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember
Forward Sales or Mortgage Backed Securities [Member] | Fair Value, Inputs - Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Forward Sales or Mortgage Backed Securities [Member] | Fair Value, Significant Other observable Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | (562)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | (182)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Forward Sales or Mortgage Backed Securities [Member] | Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Interest Rate Lock Commitments [Member] | Total Fair Value - Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 634 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember | 288 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember
Interest Rate Lock Commitments [Member] | Fair Value, Inputs - Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Interest Rate Lock Commitments [Member] | Fair Value, Significant Other observable Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 634 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 288 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Interest Rate Lock Commitments [Member] | Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Best Efforts Contracts [Member] | Total Fair Value - Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | (107)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember | 53 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = mho_TotalFairValueRecurringMember
Best Efforts Contracts [Member] | Fair Value, Inputs - Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Best Efforts Contracts [Member] | Fair Value, Significant Other observable Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | (107)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 53 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Best Efforts Contracts [Member] | Fair Value, Significant Unobservable Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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