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v2.4.1.9

Debt Senior Notes (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Nov. 14, 2016 | Dec. 31, 2014 | Nov. 15, 2018 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 102.156%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed | 104.313%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed |
Senior notes |  | $ 228,469,000 us-gaap_SeniorNotes |  | $ 228,070,000 us-gaap_SeniorNotes
Preferred Stock, Dividend Rate, Percentage |  | 9.75%us-gaap_PreferredStockDividendRatePercentage |  |
Restricted Payments Basket |  | 148,600,000 mho_RestrictedPaymentsBasket |  | 132,700,000 mho_RestrictedPaymentsBasket
2018 Convertible Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible senior subordinated notes |  | 86,250,000 us-gaap_ConvertibleSubordinatedDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
Debt Instrument, Convertible, Conversion Ratio |  | 30.9478 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation |  | 1,000 mho_DebtInstrumentConvertiblePrincipalAmountUsedInConversionRateCalculation / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
Debt Instrument, Convertible, Conversion Price |  | $ 32.31 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
Stock Issued During Period, Shares, Other |  | 2.7 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |
2018 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2018SeniorNotesMember |  |
Senior notes |  | 230,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = mho_A2018SeniorNotesMember |  |
2017 Convertible Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible senior subordinated notes |  | 57,500,000 us-gaap_ConvertibleSubordinatedDebt / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Debt Instrument, Convertible, Conversion Ratio |  | 42.0159 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation |  | 1,000 mho_DebtInstrumentConvertiblePrincipalAmountUsedInConversionRateCalculation / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Debt Instrument, Convertible, Conversion Price |  | $ 23.80 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Stock Issued During Period, Shares, Other |  | 2.4 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |
Face value [Member] | 2018 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes |  | 230,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = mho_A2018SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = mho_FacevalueMember |  |
Percentage of our aggregate consolidated net income added to base amount of calculation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent restrictions on payment of dividends |  | 50.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofouraggregateconsolidatednetincomeaddedtobaseamountofcalculationMember |  |
Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent restrictions on payment of dividends |  | 100.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofnetcashproceedsfromsaleofqualifiedequityinterestsaddedtobaseandincomelossamountincalculationMember |  |
Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent restrictions on payment of dividends |  | 100.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofouraggregateconsolidatednetincomesubtractedfrombaseamountofcalculationMember |  |
Base of restricted payments basket income calculation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Restrictions on payment of dividends |  | $ 40,000,000 mho_Restrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_BaseofrestrictedpaymentsbasketincomecalculationMember |  |

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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + 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 03 -Paragraph 16 -Article 9 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 + Details
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- 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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