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Valuation Adjustments and Write-offs Valuation Adjustments and Write-offs (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impairment of investments in Unconsolidated LLCs: | $ 390 | $ 1,029 |
Total impairments and write-offs of option deposits and pre-acquisition costs | 3,758 | 22,967 | 13,158
Impairment of operating communities: |  |  |
Impairment of operating communities: | 285 | 9,934 | 4,570
Impairment of future communities: |  |  |
Impairment of future communities: | 2,732 | 10,440 | 7,261
Impairment of land held for sale: |  |  |
Impairment of land held for sale: | 95 | 590 | 675
Option deposits and pre-acquisition costs write-offs: |  |  |
Option deposits and pre-acquisition costs write-offs: | 256 | 974 | 620
Impairment of investments in Unconsolidated LLCs: |  |  |
Impairment of investments in Unconsolidated LLCs: | 390 | 1,029 | 32
Midwest Homebuilding [Member] | Impairment of operating communities: |  |  |
Impairment of operating communities: | 285 | 5,493 | 828
Midwest Homebuilding [Member] | Impairment of future communities: |  |  |
Impairment of future communities: | 2,732 | 6,985 | 2,837
Midwest Homebuilding [Member] | Impairment of land held for sale: |  |  |
Impairment of land held for sale: | 95 | 0 | 0
Midwest Homebuilding [Member] | Option deposits and pre-acquisition costs write-offs: |  |  |
Option deposits and pre-acquisition costs write-offs: | 36 | 441 | 198
Midwest Homebuilding [Member] | Impairment of investments in Unconsolidated LLCs: |  |  |
Impairment of investments in Unconsolidated LLCs: | 390 | 979 | 0
Southern Homebuilding [Member] | Impairment of operating communities: |  |  |
Impairment of operating communities: | 0 | 2,608 | 621
Southern Homebuilding [Member] | Impairment of future communities: |  |  |
Impairment of future communities: | 0 | 3,455 | 3,134
Southern Homebuilding [Member] | Impairment of land held for sale: |  |  |
Impairment of land held for sale: | 0 | 590 | 587
Southern Homebuilding [Member] | Option deposits and pre-acquisition costs write-offs: |  |  |
Option deposits and pre-acquisition costs write-offs: | 110 | 89 | 160
Southern Homebuilding [Member] | Impairment of investments in Unconsolidated LLCs: |  |  |
Impairment of investments in Unconsolidated LLCs: | 0 | 50 | 32
Mid-Atlantic Homebuilding [Member] | Impairment of operating communities: |  |  |
Impairment of operating communities: | 0 | 1,833 | 3,121
Mid-Atlantic Homebuilding [Member] | Impairment of future communities: |  |  |
Impairment of future communities: | 0 | 0 | 1,290
Mid-Atlantic Homebuilding [Member] | Impairment of land held for sale: |  |  |
Impairment of land held for sale: | 0 | 0 | 88
Mid-Atlantic Homebuilding [Member] | Option deposits and pre-acquisition costs write-offs: |  |  |
Option deposits and pre-acquisition costs write-offs: | 110 | 444 | 262
Mid-Atlantic Homebuilding [Member] | Impairment of investments in Unconsolidated LLCs: |  |  |
Impairment of investments in Unconsolidated LLCs: | $ 0 | $ 0 | $ 0

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- Definition Total valuation adjustments and write-offs recorded during the period. + References No definition available. + Details
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- Definition Valuation adjustments recorded in costs of homes sold in the period, related to future communities, in order to reduce the carrying amount to fair value. + References No definition available. + Details
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- Definition Losses recorded relating the entity's investment in unconsolidated entities, if its investment in the unconsolidated entity, or a portion thereof, is deemed to be other than temporary impaired. + References No definition available. + Details
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X
- Definition Valuation adjustments to land the Company intends to sell or has sold recorded in costs of land sold in the period. + References No definition available. + Details
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Namespace Prefix: | mho_
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- Definition Valuation adjustments recorded in costs of homes sold in the period, related to current operating communities, in order to reduce the carrying amount to fair value. + References No definition available. + Details
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- Definition Write-offs of option deposits and pre-acquisition costs for which the entity intends to walk-away recorded during the period. + References No definition available. + Details
Name: | mho_WriteOffsOfOptionDepositsAndPreacquisitionCosts
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
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