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Supplemental Guarantor Information Supplemental Guarantor Information - Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
ASSETS:        
Cash and cash equivalents $ 29,958us-gaap_CashAndCashEquivalentsAtCarryingValue $ 15,535us-gaap_CashAndCashEquivalentsAtCarryingValue $ 89,360us-gaap_CashAndCashEquivalentsAtCarryingValue $ 128,725us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 6,140us-gaap_RestrictedCashAndCashEquivalents 6,951us-gaap_RestrictedCashAndCashEquivalents    
Mortgage loans held for sale 79,180us-gaap_LoansHeldForSaleMortgages 92,794us-gaap_LoansHeldForSaleMortgages    
Inventory 959,070us-gaap_InventoryRealEstate 918,589us-gaap_InventoryRealEstate    
Property and equipment - net 11,081us-gaap_PropertyPlantAndEquipmentNet 11,490us-gaap_PropertyPlantAndEquipmentNet    
Investments in unconsolidated joint ventures 29,449us-gaap_EquityMethodInvestments 27,769us-gaap_EquityMethodInvestments    
Deferred Income taxes 88,748us-gaap_DeferredTaxAssetsNetCurrent 94,412us-gaap_DeferredTaxAssetsNetCurrent    
Investment in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Intercompany 0mho_Intercompanyassets 0mho_Intercompanyassets    
Other assets 47,138us-gaap_OtherAssets 43,870us-gaap_OtherAssets    
TOTAL ASSETS 1,250,764us-gaap_Assets 1,211,410us-gaap_Assets    
LIABILITIES:        
Accounts payable 69,452us-gaap_AccountsPayableCurrentAndNoncurrent 75,338us-gaap_AccountsPayableCurrentAndNoncurrent    
Customer deposits 15,352us-gaap_CustomerAdvancesAndDeposits 11,759us-gaap_CustomerAdvancesAndDeposits    
Intercompany liabilities 0mho_Intercompanyliabilities 0mho_Intercompanyliabilities    
Other liabilities 66,816us-gaap_OtherLiabilities 79,723us-gaap_OtherLiabilities    
Community development district (“CDD”) obligations 2,314mho_CommunityDevelopmentDistrictObligations 2,571mho_CommunityDevelopmentDistrictObligations    
Obligation for consolidated inventory not owned 299mho_ObligationForConsolidatedInventoryNotOwned 608mho_ObligationForConsolidatedInventoryNotOwned    
Notes payable bank - homebuilding operations 90,000us-gaap_LineOfCredit 30,000us-gaap_LineOfCredit    
Notes payable bank - financial service operations 71,723us-gaap_WarehouseAgreementBorrowings 85,379us-gaap_WarehouseAgreementBorrowings    
Notes payable - other 8,876us-gaap_OtherNotesPayable 9,518us-gaap_OtherNotesPayable    
Convertible senior subordinated notes due 2017 57,500mho_A2017ConvertibleSubordiantedDebt 57,500mho_A2017ConvertibleSubordiantedDebt    
Convertible senior subordinated notes due 2018 86,250mho_A2018ConvertibleSubordinatedDebt 86,250mho_A2018ConvertibleSubordinatedDebt    
Senior notes 228,569us-gaap_SeniorNotes 228,469us-gaap_SeniorNotes    
TOTAL LIABILITIES 697,151us-gaap_Liabilities 667,115us-gaap_Liabilities    
TOTAL SHAREHOLDERS' EQUITY 553,613us-gaap_StockholdersEquity 544,295us-gaap_StockholdersEquity    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,250,764us-gaap_LiabilitiesAndStockholdersEquity 1,211,410us-gaap_LiabilitiesAndStockholdersEquity    
Parent [Member]        
ASSETS:        
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Mortgage loans held for sale 0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Inventory 0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Property and equipment - net 0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Investments in unconsolidated joint ventures 0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Deferred Income taxes 0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Investment in subsidiaries 586,036us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentMember
576,468us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Intercompany 331,314mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
330,786mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Other assets 8,582us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
9,260us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
TOTAL ASSETS 925,932us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
916,514us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
LIABILITIES:        
Accounts payable 0us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Customer deposits 0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Intercompany liabilities 0mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Other liabilities 0us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Community development district (“CDD”) obligations 0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Obligation for consolidated inventory not owned 0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Notes payable bank - homebuilding operations 0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Notes payable bank - financial service operations 0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Notes payable - other 0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentMember
0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Convertible senior subordinated notes due 2017 57,500mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentMember
57,500mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Convertible senior subordinated notes due 2018 86,250mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentMember
86,250mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Senior notes 228,569us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentMember
228,469us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
TOTAL LIABILITIES 372,319us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
372,219us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
TOTAL SHAREHOLDERS' EQUITY 553,613us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentMember
544,295us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 925,932us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentMember
916,514us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentMember
   
Guarantor Subsidiaries [Member]        
ASSETS:        
Cash and cash equivalents 16,567us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,872us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
75,221us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
113,407us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Restricted cash 6,140us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,951us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Mortgage loans held for sale 0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventory 959,070us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
918,589us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property and equipment - net 10,796us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11,189us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in unconsolidated joint ventures 15,868us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
15,033us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred Income taxes 88,492us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
94,088us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investment in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany 0mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets 27,246us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
24,378us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL ASSETS 1,124,179us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,074,100us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
LIABILITIES:        
Accounts payable 69,214us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
74,344us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Customer deposits 15,352us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11,759us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany liabilities 314,898mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
314,946mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other liabilities 61,001us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
74,413us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Community development district (“CDD”) obligations 2,314mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,571mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Obligation for consolidated inventory not owned 299mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
608mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Notes payable bank - homebuilding operations 90,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
30,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Notes payable bank - financial service operations 0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Notes payable - other 8,876us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
9,518us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Convertible senior subordinated notes due 2017 0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Convertible senior subordinated notes due 2018 0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Senior notes 0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL LIABILITIES 561,954us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
518,159us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL SHAREHOLDERS' EQUITY 562,225us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
555,941us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,124,179us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,074,100us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non-Guarantor Subsidiaries [Member]        
ASSETS:        
Cash and cash equivalents 13,391us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11,663us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
14,139us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
15,318us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Mortgage loans held for sale 79,180us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
92,794us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventory 0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property and equipment - net 285us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
301us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investments in unconsolidated joint ventures 13,581us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
12,736us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred Income taxes 256us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
324us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investment in subsidiaries 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany 0mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other assets 11,310us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
10,232us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL ASSETS 118,003us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
128,050us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
LIABILITIES:        
Accounts payable 238us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
994us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Customer deposits 0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany liabilities 16,416mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
15,840mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other liabilities 5,815us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,310us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Community development district (“CDD”) obligations 0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Obligation for consolidated inventory not owned 0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Notes payable bank - homebuilding operations 0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Notes payable bank - financial service operations 71,723us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
85,379us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Notes payable - other 0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Convertible senior subordinated notes due 2017 0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Convertible senior subordinated notes due 2018 0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Senior notes 0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL LIABILITIES 94,192us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
107,523us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL SHAREHOLDERS' EQUITY 23,811us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
20,527us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 118,003us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
128,050us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Corporate Elimination [Member]        
ASSETS:        
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Mortgage loans held for sale 0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_LoansHeldForSaleMortgages
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Inventory 0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_InventoryRealEstate
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Property and equipment - net 0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Investments in unconsolidated joint ventures 0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Deferred Income taxes 0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Investment in subsidiaries (586,036)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(576,468)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Intercompany (331,314)mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(330,786)mho_Intercompanyassets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Other assets 0us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
TOTAL ASSETS (917,350)us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(907,254)us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
LIABILITIES:        
Accounts payable 0us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_AccountsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Customer deposits 0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_CustomerAdvancesAndDeposits
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Intercompany liabilities (331,314)mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(330,786)mho_Intercompanyliabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Other liabilities 0us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Community development district (“CDD”) obligations 0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0mho_CommunityDevelopmentDistrictObligations
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Obligation for consolidated inventory not owned 0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0mho_ObligationForConsolidatedInventoryNotOwned
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Notes payable bank - homebuilding operations 0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Notes payable bank - financial service operations 0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_WarehouseAgreementBorrowings
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Notes payable - other 0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_OtherNotesPayable
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Convertible senior subordinated notes due 2017 0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0mho_A2017ConvertibleSubordiantedDebt
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Convertible senior subordinated notes due 2018 0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0mho_A2018ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
Senior notes 0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
TOTAL LIABILITIES (331,314)us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(330,786)us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
TOTAL SHAREHOLDERS' EQUITY (586,036)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
(576,468)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
   
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ (917,350)us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember
$ (907,254)us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_IntersegmentEliminationMember