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Commitments and Contingencies Legal Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Amount Reserved for Legal Expenses | $ 0.4 | $ 0.4

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration