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General - Additional Information (Detail) | Dec. 31, 2016 States
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Teleradiology [Member] |
Organization Presentation And General [Line Items] |
Number of states in which entity operates | 50

X
- Definition Organization presentation and general. + References No definition available. + Details
Name: | md_OrganizationPresentationAndGeneralLineItems
Namespace Prefix: | md_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ProductOrServiceAxis=md_TeleradiologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |