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Commitments and Contingencies Legal Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Amount Reserved for Legal Expenses	$ 0.3mho_AmountReservedForLegalExpenses	$ 0.2mho_AmountReservedForLegalExpenses

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

- Details

Name:	us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration