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Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 67,817 | $ 151,703
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 67,817 | 151,703
Mortgage loans held for sale | 108,000 | 171,580
Split dollar life insurance policies | 209 | 209
Commitments to extend real estate loans (assets) | 1,104 | 271
Whole Loan contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 | 12
Forward sales of mortgage-backed securities | 0 | 177
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 181,800 | 0
Notes Payable - Financial Services Fair Value Disclosure | 93,163 | 168,195
Notes payable - other | 9,362 | 10,576
Convertible senior subordinated notes due 2018 (a) | 0 | 86,250
Senior notes due 2021 (a) | 300,000 | 300,000
Senior notes due 2025 (a) | 250,000 | 250,000
Whole Loan contracts for committed IRLCs and mortgage loans held for sale | 122 | 0
Forward sales of mortgage-backed securities | 783 | 0
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 67,817 | 151,703
Mortgage loans held for sale | 108,000 | 171,580
Split dollar life insurance policies | 209 | 209
Commitments to extend real estate loans (assets) | 1,104 | 271
Whole Loan contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 0 | 12
Forward sales of mortgage-backed securities | 0 | 177
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 181,800 | 0
Notes Payable - Financial Services Fair Value Disclosure | 93,163 | 168,195
Notes payable - other | 8,504 | 9,437
Convertible senior subordinated notes due 2018 (a) | 0 | 93,581
Senior notes due 2021 (a) | 308,250 | 310,875
Senior notes due 2025 (a) | 233,125 | 252,500
Whole Loan contracts for committed IRLCs and mortgage loans held for sale | 122 | 0
Forward sales of mortgage-backed securities | 783 | 0
Off-Balance Sheet Letters of Credit | $ 955 | $ 1,083

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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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Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 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 + References No definition available. + Details
Name: | mho_ForwardContractsFairValueDisclosureAssets
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Senior Notes due 2025 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 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
Name: | mho_TotalCashCashEquivalentsAndRestrictedCash
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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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Details
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- Details
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