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Summary of Estimated Useful Lives Of Assets (Detail) | 12 Months Ended
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Dec. 31, 2012
Leasehold Improvements |
Property, Plant and Equipment [Line Items] |
Property plant and equipment leasehold improvements usefullife | Lease term
Vehicles |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 5 years
Maximum | Building and building improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 35 years
Maximum | Equipment and fixtures |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 15 years
Minimum | Building and building improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 years
Minimum | Equipment and fixtures |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 3 years

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- Definition Property Plant And Equipment Leasehold Improvements Usefullife + References No definition available. + Details
Name: | med_PropertyPlantAndEquipmentLeaseholdImprovementsUsefullife
Namespace Prefix: | med_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration