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General - Additional Information (Detail)	Dec. 31, 2016 States
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: