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Summary of Significant Accounting Policies Variable interest entities and unconsolidated joint ventures (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Variable Interest Entity [Line Items] |  |  |
Increase (decrease) in investments in unconsolidated joint ventures and other similar arrangements | $ (7,497)mho_Increasedecreaseininvestmentsinunconsolidatedjointventuresandothersimilararrangements |  |
Investment in unconsolidated joint ventures | 27,769 us-gaap_EquityMethodInvestments | 35,266 us-gaap_EquityMethodInvestments |
Distribution of single-family lots from unconsolidated LLC's | 25,689 mho_DistributionOfSingleFamilyLotsFromUnconsolidatedLlcs | 4,800 mho_DistributionOfSingleFamilyLotsFromUnconsolidatedLlcs | 0 mho_DistributionOfSingleFamilyLotsFromUnconsolidatedLlcs
Payments to Acquire Interest in Subsidiaries and Affiliates | $ 20,415 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | $ 29,509 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | $ 1,817 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Minimum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 61.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Increase (decrease) in investments in unconsolidated joint ventures and other similar arrangements + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + 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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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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