Guarantees and Indemnifications Guarantees (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior notes	$ 228,569,000us-gaap_SeniorNotes	$ 228,469,000us-gaap_SeniorNotes
Convertible senior subordinated notes due 2017	57,500,000mho_A2017ConvertibleSubordiantedDebt	57,500,000mho_A2017ConvertibleSubordiantedDebt
Convertible senior subordinated notes due 2018	86,250,000mho_A2018ConvertibleSubordinatedDebt	86,250,000mho_A2018ConvertibleSubordinatedDebt
Total of Loans Covered by Guarantees	15,500,000mho_TotalOfLoansCoveredByGuarantees	33,400,000mho_TotalOfLoansCoveredByGuarantees
Total of Guaranteed Loans Inquired About	5,400,000mho_TotalOfGuaranteedLoansInquiredAbout	9,100,000mho_TotalOfGuaranteedLoansInquiredAbout
Total Loans Indemnified to third parties	2,000,000mho_TotalLoansIndemnified	2,000,000mho_TotalLoansIndemnified
Loan Repurchase Guarantee Liability	2,500,000mho_LoanRepurchaseGuaranteeLiability	2,900,000mho_LoanRepurchaseGuaranteeLiability
2018 Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.625%
2017 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
2018 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Face Value [Member]
Debt Instrument [Line Items]
Senior notes	$ 230,000,000

2017 Convertible Subordianted Debt

No definition available.

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Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

2018 Convertible Subordinated Debt

+ References

No definition available.

+ Details

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Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum potential amount of future payments the guarantor could be required to make under the Company's subsidiary loan repurchase guarantees.

+ References

No definition available.

+ Details

Name:	mho_LoanRepurchaseGuaranteeLiability
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The total of all loans indemnified to third party insurers relating to certain repurchase agreements.

+ References

No definition available.

+ Details

Name:	mho_TotalLoansIndemnified
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Total of loans covered by the guarantees discussed for which inquiries were made by the purchasers of the loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	mho_
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Period Type:	instant

- Definition

The total amount of loans covered by guarantees that said loans could potentially be repurchased in the case certain conditions occur.

+ References

No definition available.

+ Details

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Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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