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Inventory Other Inventory Items - Homes under construction not subject to a sale contract (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Inventory, Gross [Abstract]
Number of Speculative Homes	703	649
Speculative Homes Carrying Value	$ 86.2	$ 89.8

X

- Definition

The number of speculative units (homes not subject to a sales contract) included in homes under construction.

+ References

No definition available.

+ Details

Name:	mho_NumberOfSpeculativeHomes
Namespace Prefix:	mho_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The carrying value of the speculative homes included in homes under construction.

+ References

No definition available.

+ Details

Name:	mho_SpeculativeHomesCarryingValue
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_OtherInventoryAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration