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Business Segments Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Revenue $ 263,159us-gaap_Revenues $ 234,841us-gaap_Revenues
Operating Income (Loss) 19,956us-gaap_OperatingIncomeLoss 16,593us-gaap_OperatingIncomeLoss
Interest 4,462us-gaap_InterestExpense 4,170us-gaap_InterestExpense
Equity in loss (income) of unconsolidated joint ventures (198)us-gaap_IncomeLossFromEquityMethodInvestments (62)us-gaap_IncomeLossFromEquityMethodInvestments
Income (loss) before income taxes 15,692us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 12,485us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Midwest Homebuilding [Member]    
Segment Reporting Information [Line Items]    
Homebuilding revenue 85,217us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
79,604us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
Operating Income (Loss) 7,796us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
7,243us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
Interest 1,324us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
1,269us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_MidwestHomebuildingMember
Southern Homebuilding [Member]    
Segment Reporting Information [Line Items]    
Homebuilding revenue 98,555us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
80,200us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
Operating Income (Loss) 8,591us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
5,877us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
Interest 1,774us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
1,591us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_SouthernHomebuildingMember
Mid-Atlantic Homebuilding [Member]    
Segment Reporting Information [Line Items]    
Homebuilding revenue 71,289us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
67,172us-gaap_HomeBuildingRevenue
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
Operating Income (Loss) 4,760us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
4,793us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
Interest 1,033us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
995us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_MidAtlanticHomebuildingMember
Financial Services [Member]    
Segment Reporting Information [Line Items]    
Financial services revenue 8,098us-gaap_FinancialServicesRevenue
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
7,865us-gaap_FinancialServicesRevenue
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
Operating Income (Loss) 5,324us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
5,026us-gaap_OperatingIncomeLoss
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
Interest 331us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
315us-gaap_InterestExpense
/ us-gaap_StatementGeographicalAxis
= mho_FinancialServicesMember
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Selling, general and administrative expenses $ (6,515)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementGeographicalAxis
= us-gaap_CorporateAndOtherMember
$ (6,346)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_StatementGeographicalAxis
= us-gaap_CorporateAndOtherMember