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Debt Debt (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
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Line of Credit Facility [Line Items] |  |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 358,600,000 |
Line of Credit Facility, Amount Outstanding | 14,400,000 | 0
letters of credit outstanding under credit facility | 19,600,000 |
Maximum borrowing availability subject to limit | 166,000,000 |
Number of Secured Letters of Credit Outstanding under Credit Facility | 3 |
Aggregate Capacity of Secured Letters of Credit under Credit Facility | 20,000,000 |
Uncommitted Letters of Credit | 2,300,000 |
Letters of Credit Outstanding Under Letter of Credit Facilities | 8,600,000 | 13,400,000
Restricted Cash for Secured Letter of Credit Agreements | 8,800,000 | 13,700,000
Low Range Uncommitted Letter of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum available amounts under Letter of Credit Facilities | 5,000,000 |
High Range Uncommittted Letter of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum available amounts under Letter of Credit Facilities | 10,000,000 |
New Unsecured Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 200,000,000 |
Sub-limit for letters of credit | 100,000,000 |
Optional increase in borrowing availability | 25,000,000 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 225,000,000 |
Maximum [Member] | New Unsecured Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facility, Basis Spread on Variable Rate | 3.25% |
Minimum [Member] | New Unsecured Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facility, Basis Spread on Variable Rate | 2.25% |

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- Definition Aggregate Capacity of Secured Letters of Credit under Credit Facility + References No definition available. + Details
Name: | mho_AggregateCapacityOfSecuredLettersOfCreditUnderCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the credit facility borrowings. + References No definition available. + Details
Name: | mho_CreditFacilityBasisSpreadonVariableRate
Namespace Prefix: | mho_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of letters of credit outstanding under the Company's Credit Facility + References No definition available. + Details
Name: | mho_LettersOfCreditOutstandingUnderCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Letters of Credit Outstanding Under the Company's Letter of Credit Facilities + References No definition available. + Details
Name: | mho_LettersOfCreditOutstandingUnderLetterOfCreditFacilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum available amounts under Letter of Credit Facilities + References No definition available. + Details
Name: | mho_MaximumavailableamountsunderLetterofCreditFacilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing availability in accordance with the borrowing base calculation, such that the the full commitment amount of the facility was available, less any borrowings and letters of credit outstanding. + References No definition available. + Details
Name: | mho_Maximumborrowingavailabilitysubjecttolimit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of secured letters of credit outstanding under the Company's Credit Facility. + References No definition available. + Details
Name: | mho_NumberOfSecuredLettersOfCreditOutstandingUnderCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Optional increase in borrowing availability + References No definition available. + Details
Name: | mho_Optionalincreaseinborrowingavailability
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents restricted cash deposits maintained as collateral for outstanding letter of credit arrangements. + References No definition available. + Details
Name: | mho_RestrictedCashForSecuredLetterOfCreditAgreements
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sub-limit for letters of credit + References No definition available. + Details
Name: | mho_Sublimitforlettersofcredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Uncommitted Letters of Credit - able to be withdrawn at any time. + References No definition available. + Details
Name: | mho_UncommittedLettersofCredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -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 22 -Subparagraph b -Article 5 + Details
Name: | us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant