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Commitments and Contingencies Legal (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Legal Liabilities Disclosure [Abstract] |  |
Amount Reserved for Legal Expenses | $ 0.3 | $ 0.6

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

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- Definition Legal Liabilities Disclosure [Abstract] + References No definition available. + Details
Name: | mho_LegalLiabilitiesDisclosureAbstract
Namespace Prefix: | mho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration