Investment in Joint Venture Arrangements Investment in Joint Venture Arrangements (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Investment in Joint Venture Arrangements [Abstract]
Maximum exposure related to investments in joint venture arrangements	$ 35,870

This item represents the total amount of investment the company is exposed to related to its investment in unconsolidated joint ventures or other similar arrangements including the amount on the entity's balance sheet of its investment in an equity method investee and its related party note receivable in Other Assets.

No definition available.

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