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Investment in Unconsolidated Joint Ventures (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Increase in Investments in Unconsolidated JVs and other joint agreements $ 1,600,000mho_IncreaseInInvestmentInLlcsAndOtherJointAgreements  
Investments in unconsolidated joint ventures 29,449,000us-gaap_EquityMethodInvestments 27,769,000us-gaap_EquityMethodInvestments
Limited Partners' Contributed Capital 29,400,000us-gaap_LimitedPartnersContributedCapital  
Notes Receivable, Related Parties 2,500,000us-gaap_NotesReceivableRelatedParties  
Capitalized Interest and Other Costs Included in Investment in Unconsolidated LLCs $ 245,000mho_CapitalizedInterestAndOtherCostsIncludedInInvestmentInUnconsolidatedLlcs $ 245,000mho_CapitalizedInterestAndOtherCostsIncludedInInvestmentInUnconsolidatedLlcs
Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 61.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Minimum [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember