Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Assumption Duration [Line Items]
Number of Operating Segments	13us-gaap_NumberOfOperatingSegments
Cash in Transit	$ 7,500,000mho_CashInTransit	$ 18,400,000mho_CashInTransit
Financial Services Cash	11,700,000mho_FinancialServicesCash	15,300,000mho_FinancialServicesCash
Restricted Cash and Cash Equivalents	6,951,000	13,902,000
Outstanding Deposits On Land and Lots	33,994,000mho_OutstandingDepositsOnLandAndLots
Land purchase deposits	23,495,000mho_LandPurchaseDeposits	14,365,000mho_LandPurchaseDeposits
Prepaid Land Acquisition Costs	4,399,000mho_PrepaidLandAcquisitionCosts
Outstanding Letters of Credit in Lieu of Cash Deposits under Certain Land Option Contracts	6,079,000
Investment in unconsolidated joint ventures	27,769,000us-gaap_EquityMethodInvestments	35,266,000us-gaap_EquityMethodInvestments
Notes Receivable, Related Parties	2,500,000us-gaap_NotesReceivableRelatedParties
Consolidated inventory not owned	779,000mho_ConsolidatedInventoryNotOwned	1,775,000mho_ConsolidatedInventoryNotOwned
Obligation for consolidated inventory not owned	608,000	1,775,000
Notes receivable	4,300,000us-gaap_NotesReceivableNet	3,200,000us-gaap_NotesReceivableNet
Debt Instrument, Unamortized Discount	9,300,000	9,900,000
Number of loans we retain mortgage servicing rights on	2,517	2,080
Servicing Asset at Fair Value, Period Increase (Decrease)	6,876,000	5,800,000
Letters of Credit and Bonds	121,928,000mho_LettersOfCreditAndBonds
Outstanding Performance Bonds	74,000,000mho_OutstandingPerformanceBonds
Performance letters of credit outstanding	21,447,000
Financial Letters of Credit	12,179,000mho_FinancialLettersOfCredit
Financial Bonds	$ 14,301,000mho_FinancialBonds
Minimum [Member]
Assumption Duration [Line Items]
Discount Rate Used in Determining Fair Value of land/lots	13.00%
Interest Rate Notes Receivable	0.00%	2.00%
Maximum [Member]
Assumption Duration [Line Items]
Discount Rate Used in Determining Fair Value of land/lots	16.00%
Interest Rate Notes Receivable	12.00%	12.00%

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Amounts in transit from title companies for home closings.

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Consolidation of inventory relating to land and lot option purchases contracts in which the entity is deemed to be the primary beneficiary of the arrangements and a transaction that did not qualify as a sale of inventory under current accounting standards thus the inventory remained on the entity's balance sheet.

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Financial Bonds

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Financial Letters of Credit

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Unrestricted cash related to the activities of the Company's financial services operations.

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Interest Rate Notes Receivable

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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.

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Amount of letters of credit and bonds outstanding as of the reporting date.

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Number of loans we retain mortgage servicing rights on

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Includes the liabilities related to the remaining exercise price of land and lot option purchases contracts.

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Outstanding Deposits On Land and Lots

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Outstanding letters of credit in lieu of cash deposits under certain land option contracts.

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Outstanding performance and surety bonds related to site improvements

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Performance letters of credit outstanding

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Prepaid Land Acquisition Costs

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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