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v2.4.1.9

Supplemental Guarantor Information Supplemental Guarantor Information - Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash (used in) provided by operating activities | $ (132,675)us-gaap_NetCashProvidedByUsedInOperatingActivities | $ (73,974)us-gaap_NetCashProvidedByUsedInOperatingActivities | $ (46,995)us-gaap_NetCashProvidedByUsedInOperatingActivities
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Change in restricted cash | 7,122 us-gaap_IncreaseDecreaseInRestrictedCash | (5,185)us-gaap_IncreaseDecreaseInRestrictedCash | 32,779 us-gaap_IncreaseDecreaseInRestrictedCash
Purchase of property and equipment | (2,946)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (2,382)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (933)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition, net of cash acquired | 0 mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired | 0 mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired | (4,707)mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired
Proceeds from Sale of Mortgage Servicing Rights (MSR) | 2,135 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR | 0 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR | 0 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR
Intercompany Investing | 0 mho_IntercompanyInvesting |  |
Investment in unconsolidated joint ventures | (20,415)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | (29,509)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | (1,817)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Return of capital from unconsolidated joint ventures | 1,523 mho_DistributionsOfCapitalFromUnconsolidatedEntities | 1,522 mho_DistributionsOfCapitalFromUnconsolidatedEntities | 0 mho_DistributionsOfCapitalFromUnconsolidatedEntities
Net cash provided by (used in) investing activities | (12,581)us-gaap_NetCashProvidedByUsedInInvestingActivities | (35,554)us-gaap_NetCashProvidedByUsedInInvestingActivities | 25,322 us-gaap_NetCashProvidedByUsedInInvestingActivities
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayment of senior notes |  |  | (41,443)us-gaap_RepaymentsOfSeniorDebt
Proceeds from issuance of senior notes |  |  | 29,700 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Proceeds from bank borrowings - homebuilding operations | 192,600 us-gaap_ProceedsFromBankDebt | 0 us-gaap_ProceedsFromBankDebt | 0 us-gaap_ProceedsFromBankDebt
Repayments of bank borrowings - homebuilding operations | (162,600)us-gaap_RepaymentsOfBankDebt | 0 us-gaap_RepaymentsOfBankDebt | 0 us-gaap_RepaymentsOfBankDebt
Proceeds from (Repayments of) bank borrowings - financial services operations | 5,350 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess | 12,072 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess | 15,351 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
Principal proceeds from note payable - other and community development district bond obligations | 1,728 us-gaap_ProceedsFromRepaymentsOfOtherDebt | (3,315)us-gaap_ProceedsFromRepaymentsOfOtherDebt | 5,304 us-gaap_ProceedsFromRepaymentsOfOtherDebt
Redemption of preferred shares | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock | (50,352)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Dividends paid on preferred shares | (4,875)us-gaap_PaymentsOfDividends | (3,656)us-gaap_PaymentsOfDividends | 0 us-gaap_PaymentsOfDividends
Net proceeds from issuance of common shares | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 54,617 us-gaap_ProceedsFromIssuanceOfCommonStock | 42,085 us-gaap_ProceedsFromIssuanceOfCommonStock
Intercompany financing | 0 mho_IntercompanyFinancing | 0 mho_IntercompanyFinancing | 0 mho_IntercompanyFinancing
Debt issue costs | (2,081)us-gaap_PaymentsOfDebtIssuanceCosts | (5,501)us-gaap_PaymentsOfDebtIssuanceCosts | (5,881)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from exercise of stock options | 1,944 us-gaap_ProceedsFromStockOptionsExercised | 2,640 us-gaap_ProceedsFromStockOptionsExercised | 4,762 us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by (used in) financing activities | 32,066 us-gaap_NetCashProvidedByUsedInFinancingActivities | 92,755 us-gaap_NetCashProvidedByUsedInFinancingActivities | 107,378 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents | (113,190)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (16,773)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 85,705 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents balance at beginning of period | 128,725 us-gaap_CashAndCashEquivalentsAtCarryingValue | 145,498 us-gaap_CashAndCashEquivalentsAtCarryingValue | 59,793 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents balance at end of period | 15,535 us-gaap_CashAndCashEquivalentsAtCarryingValue | 128,725 us-gaap_CashAndCashEquivalentsAtCarryingValue | 145,498 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash (used in) provided by operating activities | 10,200 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 7,100 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 3,500 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Change in restricted cash | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentMember
Purchase of property and equipment | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember
Acquisition, net of cash acquired |  |  | 0 mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from Sale of Mortgage Servicing Rights (MSR) | 0 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR / dei_LegalEntityAxis = us-gaap_ParentMember |  |
Intercompany Investing | (7,269)mho_IntercompanyInvesting / dei_LegalEntityAxis = us-gaap_ParentMember |  |
Investment in unconsolidated joint ventures | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_ParentMember
Return of capital from unconsolidated joint ventures | 0 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_ParentMember | 0 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_ParentMember |
Net cash provided by (used in) investing activities | (7,269)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayment of senior notes |  |  | (41,443)us-gaap_RepaymentsOfSeniorDebt / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from issuance of senior notes |  |  | 29,700 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from bank borrowings - homebuilding operations | 0 us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_ParentMember |  |
Repayments of bank borrowings - homebuilding operations | 0 us-gaap_RepaymentsOfBankDebt / dei_LegalEntityAxis = us-gaap_ParentMember |  |
Proceeds from (Repayments of) bank borrowings - financial services operations | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_ParentMember
Principal proceeds from note payable - other and community development district bond obligations | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentMember
Redemption of preferred shares |  | (50,352)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_ParentMember |
Dividends paid on preferred shares | (4,875)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember | (3,656)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember
Net proceeds from issuance of common shares |  | 54,617 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentMember | 42,085 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentMember
Intercompany financing | 0 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentMember | (96,599)mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentMember | (96,104)mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentMember
Debt issue costs | 0 us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from exercise of stock options | 1,944 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentMember | 2,640 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentMember | 4,762 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentMember
Net cash provided by (used in) financing activities | (2,931)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | (7,100)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | (3,500)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Net (decrease) increase in cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember
Cash and cash equivalents balance at beginning of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember
Cash and cash equivalents balance at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember
Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash (used in) provided by operating activities | (143,672)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (72,633)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (35,770)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Change in restricted cash | 7,122 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (5,185)us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 32,779 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Purchase of property and equipment | (2,793)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (2,146)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (854)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Acquisition, net of cash acquired |  |  | (4,707)mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from Sale of Mortgage Servicing Rights (MSR) | 0 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany Investing | 0 mho_IntercompanyInvesting / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Investment in unconsolidated joint ventures | (14,435)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (13,525)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Return of capital from unconsolidated joint ventures | 275 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Net cash provided by (used in) investing activities | (9,831)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (20,856)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 27,218 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayment of senior notes |  |  | 0 us-gaap_RepaymentsOfSeniorDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from issuance of senior notes |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from bank borrowings - homebuilding operations | 192,600 us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Repayments of bank borrowings - homebuilding operations | (162,600)us-gaap_RepaymentsOfBankDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Proceeds from (Repayments of) bank borrowings - financial services operations | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Principal proceeds from note payable - other and community development district bond obligations | 1,728 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (3,315)us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,304 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Redemption of preferred shares |  | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Dividends paid on preferred shares | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net proceeds from issuance of common shares |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany financing | 14,244 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 89,279 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 91,856 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Debt issue costs | (2,004)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (5,402)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (5,813)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from exercise of stock options | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) financing activities | 43,968 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 80,562 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 91,347 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net (decrease) increase in cash and cash equivalents | (109,535)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (12,927)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 82,795 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents balance at beginning of period | 113,407 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 126,334 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 43,539 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents balance at end of period | 3,872 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 113,407 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 126,334 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash (used in) provided by operating activities | 10,997 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,341)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (11,225)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Change in restricted cash | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Purchase of property and equipment | (153)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (236)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (79)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Acquisition, net of cash acquired |  |  | 0 mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from Sale of Mortgage Servicing Rights (MSR) | 2,135 us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany Investing | 0 mho_IntercompanyInvesting / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Investment in unconsolidated joint ventures | (5,980)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (15,984)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,817)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Return of capital from unconsolidated joint ventures | 1,248 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,522 mho_DistributionsOfCapitalFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Net cash provided by (used in) investing activities | (2,750)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (14,698)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,896)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayment of senior notes |  |  | 0 us-gaap_RepaymentsOfSeniorDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from issuance of senior notes |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from bank borrowings - homebuilding operations | 0 us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Repayments of bank borrowings - homebuilding operations | 0 us-gaap_RepaymentsOfBankDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Proceeds from (Repayments of) bank borrowings - financial services operations | 5,350 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,072 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 15,351 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Principal proceeds from note payable - other and community development district bond obligations | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Redemption of preferred shares |  | 0 us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
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Debt issue costs | (77)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (99)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (68)us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
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Net cash provided by (used in) financing activities | (11,902)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,193 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 16,031 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
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Cash and cash equivalents balance at end of period | 11,663 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 15,318 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 19,164 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Corporate Elimination [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
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Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
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Acquisition, net of cash acquired |  |  | 0 mho_BusinessAcquisitionCostOfAcquiredEntityNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
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Intercompany Investing | 7,269 mho_IntercompanyInvesting / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember |  |
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Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
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Repayments of bank borrowings - homebuilding operations | 0 us-gaap_RepaymentsOfBankDebt / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember |  |
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Intercompany financing | (7,269)mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 mho_IntercompanyFinancing / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
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Net cash provided by (used in) financing activities | 2,931 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 7,100 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 3,500 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
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Cash and cash equivalents balance at beginning of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
Cash and cash equivalents balance at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
2017 Convertible Senior Notes [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
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2017 Convertible Senior Notes [Member] | Parent [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
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2017 Convertible Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
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2017 Convertible Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
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2017 Convertible Senior Notes [Member] | Corporate Elimination [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt |  |  | 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember
2018 Convertible Senior Notes [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt | 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember | 86,250 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember | 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember
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Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt |  | 86,250 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember / dei_LegalEntityAxis = us-gaap_ParentMember |
2018 Convertible Senior Notes [Member] | Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt |  | 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
2018 Convertible Senior Notes [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt |  | 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
2018 Convertible Senior Notes [Member] | Corporate Elimination [Member] |  |  |
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from Convertible Debt |  | $ 0 us-gaap_ProceedsFromConvertibleDebt / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember / dei_LegalEntityAxis = us-gaap_IntersegmentEliminationMember |

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + 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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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow to settle a bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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