Inventory and Capitalized Interest Inventory Parentheticals (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Parantheticals - Inventory [Abstract]
Model Home Accumulated Depreciation	$ 14,194	$ 12,715

Accumulated depreciation related to our model homes in inventory.

No definition available.

Name:	mho_ModelHomeAccumulatedDepreciation
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant