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Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 103,636 | $ 34,441
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 103,636 | 34,441
Mortgage loans held for sale | 91,987 | 154,020
Split dollar life insurance policies | 212 | 214
Notes receivable | 0 | 763
Commitments to extend real estate loans (assets) | 366 | 250
Forward sales of mortgage-backed securities | 471 | 230
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 0 | 40,300
Notes Payable - Financial Services Fair Value Disclosure | 91,275 | 152,895
Notes payable - other | 4,057 | 6,415
Convertible senior subordinated notes due 2017 (a) | 0 | 57,500
Convertible senior subordinated notes due 2018 (a) | 86,250 | 86,250
Senior notes due 2021 (a) | 300,000 | 300,000
Senior notes due 2025 (a) | 250,000 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 60 | 90
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 103,636 | 34,441
Mortgage loans held for sale | 91,987 | 154,020
Split dollar life insurance policies | 212 | 214
Notes receivable | 0 | 687
Commitments to extend real estate loans (assets) | 366 | 250
Forward sales of mortgage-backed securities | 471 | 230
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 0 | 40,300
Notes Payable - Financial Services Fair Value Disclosure | 91,275 | 152,895
Notes payable - other | 3,867 | 5,999
Convertible senior subordinated notes due 2017 (a) | 0 | 65,957
Convertible senior subordinated notes due 2018 (a) | 86,897 | 88,105
Senior notes due 2021 (a) | 313,125 | 314,250
Senior notes due 2025 (a) | 255,000 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 60 | 90
Off-Balance Sheet Letters of Credit | $ 757 | $ 702

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

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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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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
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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
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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_
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- Definition Senior Notes - Fair Value Disclosures + References No definition available. + Details
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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
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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_
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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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Data Type: | xbrli:monetaryItemType
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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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