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Fair Value Measurements Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
LIABILITIES: |  |
Convertible senior subordinated notes due 2017 | $ 57,500 | $ 57,500
Convertible senior subordinated notes due 2018 | 86,250 | 0
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 178,730 | 154,178
Mortgage loans held for sale | 51,491 | 71,121
Split dollar life insurance policies | 725 | 710
Notes receivable | 4,299 | 8,787
Commitments to extend real estate loans (assets) | 0 | 1
Best Efforts Contracts for Committed IRLCs and Mortgage Loans Held for Sale - Fair Value Disclosures (Assets) | 14 | 0
Forward sales of mortgage-backed securities | 3,291 | 253
LIABILITIES: |  |
Note payable - banks | 50,442 | 67,957
Notes payable - other | 9,429 | 11,105
Convertible senior subordinated notes due 2017 | 57,500 | 57,500
Convertible senior subordinated notes due 2018 | 86,250 | 0
Senior notes due 2018 | 227,870 | 227,670
Commitments to extend real estate loans (Liabilities) | 735 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 0 | 3
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 178,730 | 154,178
Mortgage loans held for sale | 51,491 | 71,121
Split dollar life insurance policies | 708 | 678
Notes receivable | 3,843 | 7,460
Commitments to extend real estate loans (assets) | 0 | 1
Best Efforts Contracts for Committed IRLCs and Mortgage Loans Held for Sale - Fair Value Disclosures (Assets) | 14 | 0
Forward sales of mortgage-backed securities | 3,291 | 253
LIABILITIES: |  |
Note payable - banks | 50,442 | 67,957
Notes payable - other | 9,476 | 11,148
Convertible senior subordinated notes due 2017 | 69,144 | 74,175
Convertible senior subordinated notes due 2018 | 88,191 | 0
Senior notes due 2018 | 248,400 | 250,700
Commitments to extend real estate loans (Liabilities) | 735 | 0
Best efforts contracts for committed IRLCs and mortgage loans held for sale | 0 | 3
Off-Balance Sheet Letters of Credit | $ 394 | $ 493

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- Definition 2017 Convertible Subordianted Debt + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition 2018 Convertible Subordinated Debt + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Balance Type: | debit
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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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- Definition Forward sales of mortgage-backed securities + 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 Interest Rate Lock Commitments - Fair Value Disclosures (Liabilities) + 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 - banks + 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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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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- 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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