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Commitments and Contingencies Commitments and Contingencies (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Commitments and Contingencies [Abstract] |
Letters of Credit and Completion Bonds | $ 179,563
Outstanding Performance and Maintenance Bonds | 122,294
Performance letters of credit outstanding | 41,550
Financial Letters of Credit | 8,103
Financial Letters of Credit representing deposits on land and lot purchase agreements | 7,249
Financial Bonds | 7,616
Unrecorded Conditional Purchase Obligation | $ 715,716

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- Definition Commitments and Contingencies [Abstract] + References No definition available. + Details
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Namespace Prefix: | mho_
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- Definition Financial Bonds + References No definition available. + Details
Name: | mho_FinancialBonds
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial Letters of Credit + References No definition available. + Details
Name: | mho_FinancialLettersOfCredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of letters of credit and bonds outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Outstanding letters of credit in lieu of cash deposits under certain land option contracts. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Outstanding performance and surety bonds related to site improvements + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Performance letters of credit outstanding + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The remaining purchase price of land under option contracts, which represents the unrecorded conditional purchase obligation as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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