Note 8 - Real Estate Assets Held for Sale/Discontinued Operations (Detail)	1 Months Ended	3 Months Ended	6 Months Ended
Jul. 31, 2012	Apr. 30, 2012	Dec. 31, 2011	Jun. 30, 2012
Number of Vacant Properties Under Contract to be Sold				4
Number of Vacant Properties Sold During Period	3	4	1	10

Number of vacant properties under contract to be sold or otherwise disposed of which would qualify as assets held for sale and presented as discontinued operations.

No definition available.

Name:	msw_NumberOfVacantPropertiesUnderContractToBeSold
Namespace Prefix:	msw_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant