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Business Segments Business Segments - Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | $ 22,194 us-gaap_AdvancesOnInventoryPurchases | $ 23,495 us-gaap_AdvancesOnInventoryPurchases
Inventory | 936,876 mho_InventorySegments | 895,094 mho_InventorySegments
Investments in unconsolidated joint ventures | 29,449 us-gaap_EquityMethodInvestments | 27,769 us-gaap_EquityMethodInvestments
Other assets | 262,245 mho_OtherCombinedAssets | 265,052 mho_OtherCombinedAssets
Total assets | 1,250,764 us-gaap_Assets | 1,211,410 us-gaap_Assets
Midwest Homebuilding [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 4,426 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 4,573 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Inventory | 301,790 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 303,037 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Investments in unconsolidated joint ventures | 1,866 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 1,764 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Other assets | 9,020 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 7,933 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Total assets | 317,102 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember | 317,307 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_MidwestHomebuildingMember
Southern Homebuilding [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 13,894 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 14,752 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Inventory | 368,092 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 331,938 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Investments in unconsolidated joint ventures | 27,583 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 26,005 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Other assets | 21,025 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 16,829 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Total assets | 430,594 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember | 389,524 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_SouthernHomebuildingMember
Mid-Atlantic Homebuilding [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 3,874 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 4,170 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Inventory | 266,994 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 260,119 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Investments in unconsolidated joint ventures | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Other assets | 7,748 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 7,536 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Total assets | 278,616 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember | 271,825 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_MidAtlanticHomebuildingMember
Corporate, Financial Services and Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 0 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember | 0 us-gaap_AdvancesOnInventoryPurchases / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember
Inventory | 0 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember | 0 mho_InventorySegments / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember
Investments in unconsolidated joint ventures | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember
Other assets | 224,452 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember | 232,754 mho_OtherCombinedAssets / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember
Total assets | $ 224,452 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember | $ 232,754 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mho_CorporateFinancialServicesAndUnallocatedMember

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- Definition Inventory - Segments, which includes single-family lots, land and land development costs; land held for sale; homes under construction; model homes and furnishings; community development district infrastructure; and consolidated inventory not owned. + References No definition available. + Details
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- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet including cash and cash equivalents, restricted cash, property and equipment - net, and mortgage loans held for sale. + References No definition available. + Details
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- Definition Carrying value of capitalized payments made in advance for inventory that is expected to be received within one year or the normal operating cycle, if longer. + 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 210.5-02.8) -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 8 -Article 5 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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