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Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 23,308 | $ 13,101
Mortgage loans held for sale | 95,545 | 127,001
Split dollar life insurance policies | 214 | 199
Notes receivable | 1,188 | 3,153
Commitments to extend real estate loans (assets) | 709 | 321
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 85,000 | 43,800
Notes Payable - Financial Services Fair Value Disclosure | 91,483 | 123,648
Notes payable - other | 8,566 | 8,441
Convertible senior subordinated notes due 2017 - Fair Value Disclosure | 57,500 | 57,500
Convertible senior subordinated notes due 2018 - Fair Value Disclosure | 86,250 | 86,250
Senior notes due 2021 | 300,000 | 300,000
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 175 | 206
Forward sales of mortgage-backed securities | 338 | 93
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 23,308 | 13,101
Mortgage loans held for sale | 95,545 | 127,001
Split dollar life insurance policies | 214 | 199
Notes receivable | 1,006 | 3,076
Commitments to extend real estate loans (assets) | 709 | 321
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 85,000 | 43,800
Notes Payable - Financial Services Fair Value Disclosure | 91,483 | 123,648
Notes payable - other | 7,922 | 8,039
Convertible senior subordinated notes due 2017 - Fair Value Disclosure | 63,609 | 61,884
Convertible senior subordinated notes due 2018 - Fair Value Disclosure | 88,083 | 84,741
Senior notes due 2021 | 314,250 | 295,500
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 175 | 206
Forward sales of mortgage-backed securities | 338 | 93
Off-Balance Sheet Letters of Credit | $ 839 | $ 735

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- Definition Value of best efforts contracts for committed interest rate lock commitments and mortgage loans held for sale as of the balance sheet date. + References No definition available. + Details
Name: | mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Convertible senior subordinated notes due 2017 - fair value disclosure + 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 Convertible senior subordinated notes due 2018 - Fair Value Disclosure + References No definition available. + Details
Name: | mho_Convertibleseniorsubordinatednotesdue2018FairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Forward sales of mortgage-backed securities - fair value disclosures (liabilities) + References No definition available. + Details
Name: | mho_ForwardContractsFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Interest Rate Lock Commitments - Fair Value Disclosures (Assets) + References No definition available. + Details
Name: | mho_InterestRateLockCommitmentsFairValueDisclosuresAssets
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage Loans Held For Sale + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes Payable - Financial Services Fair Value Disclosure + References No definition available. + Details
Name: | mho_NotesPayableFinancialServicesFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notes Payable - Homebuilding + 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 Off-Balance Sheet Letters of Credit + 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 Including the current and noncurrent portions, this element represents the loans payable which were initially due after one year or beyond the operating cycle, if longer, and which are not otherwise defined in the taxonomy. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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- Definition Senior Notes - Fair Value Disclosures + 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 Split dollar life insurance policies - amount as of the balance sheet date which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total Cash, Cash Equivalents and Restricted Cash + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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