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Fair Value Measurements Assets and Liabilities Measured on a Non-Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long Lived Real Estate Assets Fair Value Disclosure | $ 0 | $ 76 | $ 0 | $ 1,605
Total losses | 0 | 622 | 0 | 1,426
Long Lived Assets Initial Basis | $ 0 | $ 698 | $ 0 | $ 3,031

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- Definition Long lived assets initial basis. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The fair value of long lived real estate assets that are held by the entity and are expected to provide future economic benefit, that were impaired during the reporting period. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The charge against earnings resulting from the aggregate write down of land, terminated options/purchase contracts and related pre acquisition costs, and real estate from their carrying value to their fair value. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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