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Valuation Adjustments and Write-offs Valuation Adjustments and Write-offs (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Impairment of investments in Unconsolidated LLCs | $ 0 |  | $ 390
Total valuation adjustments and write-offs | 900 | 126 |
Impairment of Operating Communities [Member] |  |  |
Impairment of operating communities | 0 | 0 |
Impairment of Future Communities [Member] |  |  |
Impairment of future communities | 252 | 0 |
Impairment of Land Held for Sale [Member] |  |  |
Impairment of land held for sale | 648 | 95 |
Option Deposits and Pre-Acquisition Write-Offs [Member] |  |  |
Option deposits and pre-acquisition costs write-offs | 0 | 31 |
Impairment of Investments in Unconsolidated LLCs [Member] |  |  |
Impairment of investments in Unconsolidated LLCs | 0 | 0 |
Midwest Homebuilding [Member] | Impairment of Operating Communities [Member] |  |  |
Impairment of operating communities | 0 | 0 |
Midwest Homebuilding [Member] | Impairment of Future Communities [Member] |  |  |
Impairment of future communities | 252 | 0 |
Midwest Homebuilding [Member] | Impairment of Land Held for Sale [Member] |  |  |
Impairment of land held for sale | 648 | 95 |
Midwest Homebuilding [Member] | Option Deposits and Pre-Acquisition Write-Offs [Member] |  |  |
Option deposits and pre-acquisition costs write-offs | 0 | 2 |
Midwest Homebuilding [Member] | Impairment of Investments in Unconsolidated LLCs [Member] |  |  |
Impairment of investments in Unconsolidated LLCs | 0 | 0 |
Southern Homebuilding [Member] | Impairment of Operating Communities [Member] |  |  |
Impairment of operating communities | 0 | 0 |
Southern Homebuilding [Member] | Impairment of Future Communities [Member] |  |  |
Impairment of future communities | 0 | 0 |
Southern Homebuilding [Member] | Impairment of Land Held for Sale [Member] |  |  |
Impairment of land held for sale | 0 | 0 |
Southern Homebuilding [Member] | Option Deposits and Pre-Acquisition Write-Offs [Member] |  |  |
Option deposits and pre-acquisition costs write-offs | 0 | 7 |
Southern Homebuilding [Member] | Impairment of Investments in Unconsolidated LLCs [Member] |  |  |
Impairment of investments in Unconsolidated LLCs | 0 | 0 |
Mid-Atlantic Homebuilding [Member] | Impairment of Operating Communities [Member] |  |  |
Impairment of operating communities | 0 | 0 |
Mid-Atlantic Homebuilding [Member] | Impairment of Future Communities [Member] |  |  |
Impairment of future communities | 0 | 0 |
Mid-Atlantic Homebuilding [Member] | Impairment of Land Held for Sale [Member] |  |  |
Impairment of land held for sale | 0 | 0 |
Mid-Atlantic Homebuilding [Member] | Option Deposits and Pre-Acquisition Write-Offs [Member] |  |  |
Option deposits and pre-acquisition costs write-offs | 0 | 22 |
Mid-Atlantic Homebuilding [Member] | Impairment of Investments in Unconsolidated LLCs [Member] |  |  |
Impairment of investments in Unconsolidated LLCs | $ 0 | $ 0 |

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

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- 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
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
Name: | mho_ValuationAdjustmentsToInvestmentsInUnconsolidatedEntities
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
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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
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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