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Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 26,947 | $ 22,486
Mortgage loans held for sale | 75,063 | 92,794
Split dollar life insurance policies | 202 | 187
Notes receivable | 3,731 | 4,288
Commitments to extend real estate loans (assets) | 61 | 289
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 | 58
Forward sales of mortgage-backed securities | 1,250 | 0
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 105,600 | 30,000
Notes Payable - Financial Services Fair Value Disclosure | 69,681 | 85,379
Notes payable - other | 8,230 | 9,518
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 | 228,669 | 228,469
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 76 | 0
Forward sales of mortgage-backed securities | 0 | 182
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 26,947 | 22,486
Mortgage loans held for sale | 75,063 | 92,794
Split dollar life insurance policies | 202 | 187
Notes receivable | 3,527 | 3,793
Commitments to extend real estate loans (assets) | 61 | 289
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 | 58
Forward sales of mortgage-backed securities | 1,250 | 0
LIABILITIES: |  |
Notes Payable - Homebuilding Fair Value Disclosure | 105,600 | 30,000
Notes Payable - Financial Services Fair Value Disclosure | 69,681 | 85,379
Notes payable - other | 7,842 | 9,089
Convertible senior subordinated notes due 2017 - Fair Value Disclosure | 67,850 | 67,634
Convertible senior subordinated notes due 2018 - Fair Value Disclosure | 86,250 | 87,544
Senior notes | 238,050 | 239,488
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 76 | 0
Forward sales of mortgage-backed securities | 0 | 182
Off-Balance Sheet Letters of Credit | $ 536 | $ 881

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- Definition Best Efforts Contracts for Committed Interest Rate Lock Commitments and Mortgage Loans Held for Sale - Fair Value Disclosures (Assets) + References No definition available. + Details
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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
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Convertible senior subordinated notes due 2017 - fair value disclosure + References No definition available. + Details
Name: | mho_Convertibleseniorsubordinatednotesdue2017FairValueDisclosure
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
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Namespace Prefix: | mho_
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- Definition Forward sales of mortgage-backed securities + References No definition available. + Details
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- Definition Forward sales of mortgage-backed securities - fair value disclosures (liabilities) + References No definition available. + Details
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- Definition Interest Rate Lock Commitments - Fair Value Disclosures (Assets) + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
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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
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- Definition Notes Payable - Financial Services Fair Value Disclosure + References No definition available. + Details
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- Definition Notes Payable - Homebuilding + References No definition available. + Details
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- Definition Off-Balance Sheet Letters of Credit + References No definition available. + Details
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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
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- Definition Senior Notes - Fair Value Disclosures + References No definition available. + Details
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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
Name: | mho_SplitDollarLifeInsurancePolicies
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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- 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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