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Legal Liabilities Legal Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Legal Liabilities [Abstract] |  |
Amount Reserved for Legal Expenses | $ 376 | $ 540

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- Definition Amount reserved for legal expenses + References No definition available. + Details
Name: | mho_AmountReservedForLegalExpenses
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | mho_LegalLiabilitiesAbstract
Namespace Prefix: | mho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration