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Fair Value Measurements Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 100,911 | $ 142,627
Mortgage loans held for sale | 55,750 | 81,810
Split dollar life insurance policies | 185 | 171
Notes receivable | 4,692 | 3,151
Commitments to extend real estate loans (assets) | 402 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 66 | 479
Forward sales of mortgage-backed securities | 180 | 745
LIABILITIES: |  |
Note payable - banks | 51,532 | 80,029
Notes payable - other | 7,757 | 7,790
Commitments to extend real estate loans (Liabilities) | 0 | 319
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 100,911 | 142,627
Mortgage loans held for sale | 55,750 | 81,810
Split dollar life insurance policies | 185 | 171
Notes receivable | 3,780 | 2,784
Commitments to extend real estate loans (assets) | 402 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale - fair value disclosures (assets) | 66 | 479
Forward sales of mortgage-backed securities | 180 | 745
LIABILITIES: |  |
Note payable - banks | 51,532 | 80,029
Notes payable - other | 7,651 | 7,452
Commitments to extend real estate loans (Liabilities) | 0 | 319
Off-Balance Sheet Letters of Credit | 356 | 413
2017 Convertible Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Convertible subordinated debt | 57,500 | 57,500
2017 Convertible Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Convertible subordinated debt | 69,431 | 74,391
2018 Convertible Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Convertible subordinated debt | 86,250 | 86,250
2018 Convertible Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Convertible subordinated debt | 91,748 | 95,845
2018 Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Senior notes | 228,169 | 228,070
2018 Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
LIABILITIES: |  |
Senior notes | $ 248,113 | $ 248,975

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

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- Definition Convertible Senior Notes - Fair Value Disclosure + References No definition available. + Details
Name: | mho_ConvertibleSeniorNotesFairValueDisclosure
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 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 Interest Rate Lock Commitments - Fair Value Disclosures (Liabilities) + References No definition available. + Details
Name: | mho_InterestRateLockCommitmentsFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Notes payable - banks + References No definition available. + Details
Name: | mho_NotesPayableBanksFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Off-Balance Sheet Letters of Credit + References No definition available. + Details
Name: | mho_OffBalanceSheetLettersofCredit
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
Balance Type: | na
Period Type: | instant

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- Definition Senior Notes - Fair Value Disclosures + References No definition available. + Details
Name: | mho_SeniorNotesFairValueDisclosures
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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- Details
Name: | us-gaap_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant