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Business Segments Business Segments - Valuation Adjustments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Total Of Valuation Adjustments And Write Offs | $ 900 | $ 126
Midwest Homebuilding [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Total Of Valuation Adjustments And Write Offs | 900 | 97
Southern Homebuilding [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Total Of Valuation Adjustments And Write Offs | 0 | 7
Mid-Atlantic Homebuilding [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Total Of Valuation Adjustments And Write Offs | $ 0 | $ 22

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- Definition Valuation adjustments and write-offs by reportable segment which include (1) the charges against an entity's costs and expenses in the period to reduce the carrying amount of real property to fair value and to write off option costs and pre-acquisition costs; (2) the entity's proportionate share of valuation adjustments related to assets of unconsolidated entities in which the entity has investments in equity in earnings (loss) from unconsolidated entities; and (3) losses recorded related to the entity's investments in unconsolidated entities, if its investments in the unconsolidated entity, or a portion thereof, is deemed to be other than temporary. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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