Coronavirus Pandemic (COVID-19) - Additional Information (Detail) $ in Millions	Mar. 31, 2022 USD ($)
COVID-19 [Member]
Proceeds From Contribution In Aid Of Reimbursement of Lost Revenue	$ 10.4

Proceeds From Contribution In Aid Of Reimbursement of Lost Revenue.

No definition available.

Name:	md_ProceedsFromContributionInAidOfReimbursementOfLostRevenue
Namespace Prefix:	md_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant