Condensed Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net of Tax	$ 1,694	$ 742	$ 1,157

Net Of Tax, Unrealized Holding Gain (Loss) on Investments

No definition available.

Name:	md_NetOfTaxUnrealizedHoldingGainLossOnInvestments
Namespace Prefix:	md_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration