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Business Segments Business Segments - Valuation Adjustments (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Total valuation adjustments and write-offs | $ 622,000 | $ 2,136,000 | $ 1,426,000 | $ 4,237,000
Impairment of Operating Communities [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Operating Communities | 0 | 481,000 | 804,000 | 481,000
Impairment of Operating Communities [Member] | Midwest Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Operating Communities | 0 | 481,000 | 804,000 | 481,000
Impairment of Operating Communities [Member] | Southern Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Operating Communities | 0 | 0 | 0 | 0
Impairment of Operating Communities [Member] | Mid-Atlantic Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Operating Communities | 0 | 0 | 0 | 0
Impairment of Future Communities [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Future Communities | 622,000 | 1,655,000 | 622,000 | 2,465,000
Impairment of Future Communities [Member] | Midwest Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Future Communities | 622,000 | 1,655,000 | 622,000 | 2,465,000
Impairment of Future Communities [Member] | Southern Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Future Communities | 0 | 0 | 0 | 0
Impairment of Future Communities [Member] | Mid-Atlantic Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Future Communities | 0 | 0 | 0 | 0
Impairment of Land Held for Sale [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Land With Intend To Sell Or Has Sold To Third Parties | 0 | 0 | 0 | 1,291,000
Impairment of Land Held for Sale [Member] | Midwest Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Land With Intend To Sell Or Has Sold To Third Parties | 0 | 0 | 0 | 1,291,000
Impairment of Land Held for Sale [Member] | Southern Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Land With Intend To Sell Or Has Sold To Third Parties | 0 | 0 | 0 | 0
Impairment of Land Held for Sale [Member] | Mid-Atlantic Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Land With Intend To Sell Or Has Sold To Third Parties | 0 | 0 | 0 | 0
Option Deposits and Pre-Acquisition Write-Offs [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write Offs Of Option Deposits And Preacquisition Costs | 0 | 0 | 0 | 0
Option Deposits and Pre-Acquisition Write-Offs [Member] | Midwest Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write Offs Of Option Deposits And Preacquisition Costs | 0 | 0 | 0 | 0
Option Deposits and Pre-Acquisition Write-Offs [Member] | Southern Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write Offs Of Option Deposits And Preacquisition Costs | 0 | 0 | 0 | 0
Option Deposits and Pre-Acquisition Write-Offs [Member] | Mid-Atlantic Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Write Offs Of Option Deposits And Preacquisition Costs | 0 | 0 | 0 | 0
Impairment of Investments in Unconsolidated LLCs [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Investments In Unconsolidated Entities | 0 | 0 | 0 | 0
Impairment of Investments in Unconsolidated LLCs [Member] | Midwest Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Investments In Unconsolidated Entities | 0 | 0 | 0 | 0
Impairment of Investments in Unconsolidated LLCs [Member] | Southern Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Investments In Unconsolidated Entities | 0 | 0 | 0 | 0
Impairment of Investments in Unconsolidated LLCs [Member] | Mid-Atlantic Homebuilding [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Valuation Adjustments To Investments In Unconsolidated Entities | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Total valuation adjustments and write-offs recorded during the period. + References No definition available. + Details
Name: | mho_TotalValuationAdjustmentsAndWriteOffs
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Valuation adjustments recorded in costs of homes sold in the period, related to future communities, in order to reduce the carrying amount to fair value. + References No definition available. + Details
Name: | mho_ValuationAdjustmentsToFutureCommunities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Losses recorded relating the entity's investment in unconsolidated entities, if its investment in the unconsolidated entity, or a portion thereof, is deemed to be other than temporary impaired. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Valuation adjustments to land the Company intends to sell or has sold recorded in costs of land sold in the period. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Valuation adjustments recorded in costs of homes sold in the period, related to current operating communities, in order to reduce the carrying amount to fair value. + References No definition available. + Details
Name: | mho_ValuationAdjustmentsToOperatingCommunities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Write-offs of option deposits and pre-acquisition costs for which the entity intends to walk-away recorded during the period. + References No definition available. + Details
Name: | mho_WriteOffsOfOptionDepositsAndPreacquisitionCosts
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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