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Property And Equipment (Details) (USD $) In Millions	Sep. 30, 2011
Property And Equipment [Abstract]
Purchase of an office building	$ 18.5

X

- Definition

Purchase Of Office Building

+ Details

Name:	md_PurchaseOfOfficeBuilding
Namespace Prefix:	md
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration