Supplemental Guarantor Information Supplemental Guarantor Information - Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
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)	$ (73,974)	$ (46,995)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Change in restricted cash	7,122	(5,185)	32,779
Purchase of property and equipment	(2,946)	(2,382)	(933)
Acquisition, net of cash acquired	0	0	(4,707)
Proceeds from Sale of Mortgage Servicing Rights (MSR)	2,135	0	0
Intercompany Investing	0mho_IntercompanyInvesting
Investment in unconsolidated joint ventures	(20,415)	(29,509)	(1,817)
Return of capital from unconsolidated joint ventures	1,523	1,522	0
Net cash provided by (used in) investing activities	(12,581)	(35,554)	25,322
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
Proceeds from bank borrowings - homebuilding operations	192,600us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt
Repayments of bank borrowings - homebuilding operations	(162,600)us-gaap_RepaymentsOfBankDebt	0us-gaap_RepaymentsOfBankDebt	0us-gaap_RepaymentsOfBankDebt
Proceeds from (Repayments of) bank borrowings - financial services operations	5,350	12,072	15,351
Principal proceeds from note payable - other and community development district bond obligations	1,728	(3,315)	5,304
Redemption of preferred shares	0	(50,352)	0
Dividends paid on preferred shares	(4,875)us-gaap_PaymentsOfDividends	(3,656)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Net proceeds from issuance of common shares	0	54,617	42,085
Intercompany financing	0mho_IntercompanyFinancing	0mho_IntercompanyFinancing	0mho_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	2,640	4,762
Net cash provided by (used in) financing activities	32,066	92,755	107,378
Net (decrease) increase in cash and cash equivalents	(113,190)	(16,773)	85,705
Cash and cash equivalents balance at beginning of period	128,725	145,498	59,793
Cash and cash equivalents balance at end of period	15,535	128,725	145,498
Parent [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash (used in) provided by operating activities	10,200	7,100	3,500
Net Cash Provided by (Used in) Investing Activities [Abstract]
Change in restricted cash	0	0	0
Purchase of property and equipment	0	0	0
Acquisition, net of cash acquired			0
Proceeds from Sale of Mortgage Servicing Rights (MSR)	0
Intercompany Investing	(7,269)
Investment in unconsolidated joint ventures	0	0	0
Return of capital from unconsolidated joint ventures	0	0
Net cash provided by (used in) investing activities	(7,269)	0	0
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayment of senior notes			(41,443)
Proceeds from issuance of senior notes			29,700
Proceeds from bank borrowings - homebuilding operations	0
Repayments of bank borrowings - homebuilding operations	0
Proceeds from (Repayments of) bank borrowings - financial services operations	0	0	0
Principal proceeds from note payable - other and community development district bond obligations	0	0	0
Redemption of preferred shares		(50,352)
Dividends paid on preferred shares	(4,875)	(3,656)	0
Net proceeds from issuance of common shares		54,617	42,085
Intercompany financing	0	(96,599)	(96,104)
Debt issue costs	0	0	0
Proceeds from exercise of stock options	1,944	2,640	4,762
Net cash provided by (used in) financing activities	(2,931)	(7,100)	(3,500)
Net (decrease) increase in cash and cash equivalents	0	0	0
Cash and cash equivalents balance at beginning of period	0	0	0
Cash and cash equivalents balance at end of period	0	0	0
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash (used in) provided by operating activities	(143,672)	(72,633)	(35,770)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Change in restricted cash	7,122	(5,185)	32,779
Purchase of property and equipment	(2,793)	(2,146)	(854)
Acquisition, net of cash acquired			(4,707)
Proceeds from Sale of Mortgage Servicing Rights (MSR)	0
Intercompany Investing	0
Investment in unconsolidated joint ventures	(14,435)	(13,525)	0
Return of capital from unconsolidated joint ventures	275	0
Net cash provided by (used in) investing activities	(9,831)	(20,856)	27,218
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayment of senior notes			0
Proceeds from issuance of senior notes			0
Proceeds from bank borrowings - homebuilding operations	192,600
Repayments of bank borrowings - homebuilding operations	(162,600)
Proceeds from (Repayments of) bank borrowings - financial services operations	0	0	0
Principal proceeds from note payable - other and community development district bond obligations	1,728	(3,315)	5,304
Redemption of preferred shares		0
Dividends paid on preferred shares	0	0	0
Net proceeds from issuance of common shares		0	0
Intercompany financing	14,244	89,279	91,856
Debt issue costs	(2,004)	(5,402)	(5,813)
Proceeds from exercise of stock options	0	0	0
Net cash provided by (used in) financing activities	43,968	80,562	91,347
Net (decrease) increase in cash and cash equivalents	(109,535)	(12,927)	82,795
Cash and cash equivalents balance at beginning of period	113,407	126,334	43,539
Cash and cash equivalents balance at end of period	3,872	113,407	126,334
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash (used in) provided by operating activities	10,997	(1,341)	(11,225)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Change in restricted cash	0	0	0
Purchase of property and equipment	(153)	(236)	(79)
Acquisition, net of cash acquired			0
Proceeds from Sale of Mortgage Servicing Rights (MSR)	2,135
Intercompany Investing	0
Investment in unconsolidated joint ventures	(5,980)	(15,984)	(1,817)
Return of capital from unconsolidated joint ventures	1,248	1,522
Net cash provided by (used in) investing activities	(2,750)	(14,698)	(1,896)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayment of senior notes			0
Proceeds from issuance of senior notes			0
Proceeds from bank borrowings - homebuilding operations	0
Repayments of bank borrowings - homebuilding operations	0
Proceeds from (Repayments of) bank borrowings - financial services operations	5,350	12,072	15,351
Principal proceeds from note payable - other and community development district bond obligations	0	0	0
Redemption of preferred shares		0
Dividends paid on preferred shares	(10,200)	(7,100)	(3,500)
Net proceeds from issuance of common shares		0	0
Intercompany financing	(6,975)	7,320	4,248
Debt issue costs	(77)	(99)	(68)
Proceeds from exercise of stock options	0	0	0
Net cash provided by (used in) financing activities	(11,902)	12,193	16,031
Net (decrease) increase in cash and cash equivalents	(3,655)	(3,846)	2,910
Cash and cash equivalents balance at beginning of period	15,318	19,164	16,254
Cash and cash equivalents balance at end of period	11,663	15,318	19,164
Corporate Elimination [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash (used in) provided by operating activities	(10,200)	(7,100)	(3,500)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Change in restricted cash	0	0	0
Purchase of property and equipment	0	0	0
Acquisition, net of cash acquired			0
Proceeds from Sale of Mortgage Servicing Rights (MSR)	0
Intercompany Investing	7,269
Investment in unconsolidated joint ventures	0	0	0
Return of capital from unconsolidated joint ventures	0	0
Net cash provided by (used in) investing activities	7,269	0	0
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayment of senior notes			0
Proceeds from issuance of senior notes			0
Proceeds from bank borrowings - homebuilding operations	0
Repayments of bank borrowings - homebuilding operations	0
Proceeds from (Repayments of) bank borrowings - financial services operations	0	0	0
Principal proceeds from note payable - other and community development district bond obligations	0	0	0
Redemption of preferred shares		0
Dividends paid on preferred shares	10,200	7,100	3,500
Net proceeds from issuance of common shares		0	0
Intercompany financing	(7,269)	0	0
Debt issue costs	0	0	0
Proceeds from exercise of stock options	0	0	0
Net cash provided by (used in) financing activities	2,931	7,100	3,500
Net (decrease) increase in cash and cash equivalents	0	0	0
Cash and cash equivalents balance at beginning of period	0	0	0
Cash and cash equivalents balance at end of period	0	0	0
2017 Convertible Senior Notes [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt	0	0	57,500
2017 Convertible Senior Notes [Member] \| Parent [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt			57,500
2017 Convertible Senior Notes [Member] \| Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt			0
2017 Convertible Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt			0
2017 Convertible Senior Notes [Member] \| Corporate Elimination [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt			0
2018 Convertible Senior Notes [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt	0	86,250	0
2018 Convertible Senior Notes [Member] \| Parent [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt		86,250
2018 Convertible Senior Notes [Member] \| Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt		0
2018 Convertible Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt		0
2018 Convertible Senior Notes [Member] \| Corporate Elimination [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Convertible Debt		$ 0

Business acquisition, cost of acquired entity, net of cash acquired

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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.

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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.

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