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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurements [Abstract]
Letters of Credit Potential Commitments, Amount	$ 28,980	$ 35,831

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- Details

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Namespace Prefix:	mho_
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant