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Community Development District Infrastructure and Related Obligations Community Development District Infrastructure and Related Obligations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long Term CDDs issued and outstanding [Line Items]    
CDDs Principal Amount $ 14,787us-gaap_OtherLongTermDebt $ 13,260us-gaap_OtherLongTermDebt
Community development district obligations 2,571mho_CommunityDevelopmentDistrictObligations 3,130mho_CommunityDevelopmentDistrictObligations
CDD due 12/1/2022 [Member]    
Long Term CDDs issued and outstanding [Line Items]    
CDDs, Issuance Date Jul. 15, 2004  
CDDs, Maturity Date Dec. 01, 2022  
CDDs, Percentage Interest 6.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212022Member
 
CDDs Principal Amount 2,922us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212022Member
3,200us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212022Member
CDD due 12/1/2036 [Member]    
Long Term CDDs issued and outstanding [Line Items]    
CDDs, Issuance Date Jul. 15, 2004  
CDDs, Maturity Date Dec. 01, 2036  
CDDs, Percentage Interest 6.25%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212036Member
 
CDDs Principal Amount 10,060us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212036Member
10,060us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue1212036Member
CDD due 5/1/2037 [Member]    
Long Term CDDs issued and outstanding [Line Items]    
CDDs, Issuance Date Jul. 22, 2014  
CDDs, Maturity Date Nov. 01, 2045  
CDDs, Percentage Interest 5.28%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue512037Member
 
CDDs Principal Amount $ 1,805us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue512037Member
$ 0us-gaap_OtherLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= mho_CddDue512037Member