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Fair Value Measurements Assets Measured on a Non-Recurring Basis (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |
Adjusted basis of inventory | $ 1,583 | $ 607 | $ 1,901 | $ 607
Impairments | 1,201 | 472 | 2,101 | 567
Initial Basis of inventory | $ 2,784 | $ 1,079 | $ 4,002 | $ 1,174

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- Definition Long lived assets initial basis. + References No definition available. + Details
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Namespace Prefix: | mho_
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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
Name: | mho_LongLivedRealEstateAssetsFairValueDisclosure
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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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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