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Business Segments Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Number of Operating Segments | 13 us-gaap_NumberOfOperatingSegments |  |
Revenue | $ 1,215,180 us-gaap_Revenues | $ 1,036,782 us-gaap_Revenues | $ 761,905 us-gaap_Revenues
Operating income (loss): | 82,754 us-gaap_OperatingIncomeLoss | 58,693 us-gaap_OperatingIncomeLoss | 28,830 us-gaap_OperatingIncomeLoss
Interest | 13,365 us-gaap_InterestExpense | 15,938 us-gaap_InterestExpense | 16,071 us-gaap_InterestExpense
Equity in income of unconsolidated joint ventures | (347)us-gaap_IncomeLossFromEquityMethodInvestments | (306)us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Loss on Extinguishment of Debt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 1,726 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
Income (loss) before income taxes | 69,736 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 41,335 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 12,759 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Depreciation and amortization: | 8,296 us-gaap_DepreciationDepletionAndAmortization | 8,311 us-gaap_DepreciationDepletionAndAmortization | 9,742 us-gaap_DepreciationDepletionAndAmortization
Total valuation adjustments and write-offs | 3,457 mho_TotalValuationAdjustmentsAndWriteOffs | 5,800 mho_TotalValuationAdjustmentsAndWriteOffs | 3,758 mho_TotalValuationAdjustmentsAndWriteOffs
Midwest Homebuilding [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Homebuilding revenue | 426,090 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 336,242 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 281,959 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Operating income (loss): | 37,484 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 21,469 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 11,443 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Interest | 3,001 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 4,923 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 5,502 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Depreciation and amortization: | 1,277 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 1,063 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 2,834 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Southern Homebuilding [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Homebuilding revenue | 420,901 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 324,436 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 189,714 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Operating income (loss): | 34,341 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 23,653 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 14,530 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Interest | 5,445 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 6,142 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 3,742 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Depreciation and amortization: | 1,584 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 1,230 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 968 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Mid-Atlantic Homebuilding [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Homebuilding revenue | 338,067 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 347,565 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 266,976 us-gaap_HomeBuildingRevenue / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Operating income (loss): | 27,502 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 27,297 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 15,130 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Interest | 3,480 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 3,491 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 5,406 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Depreciation and amortization: | 970 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 995 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 975 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Financial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Financial services revenue | 30,122 us-gaap_FinancialServicesRevenue / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 28,539 us-gaap_FinancialServicesRevenue / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 23,256 us-gaap_FinancialServicesRevenue / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember
Operating income (loss): | 15,616 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 15,798 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 12,436 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember
Interest | 1,439 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 1,382 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 1,421 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember
Depreciation and amortization: | 201 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 138 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember | 140 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = mho_FinancialServicesMember
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Less: Corporate selling, general and administrative expenses | (32,189)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember | (29,524)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember | (24,709)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember
Depreciation and amortization: | $ 4,264 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember | $ 4,885 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember | $ 4,825 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementGeographicalAxis = us-gaap_CorporateAndOtherMember

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- Definition Revenue related to the sale of homes and home building activities including design, development, general contracting, and renovation services for residential buildings, including single-family houses, multifamily housing, townhouses, apartments, and modular housing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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