Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Unrealized holding gain (loss) on investments, net of tax of $227 and $894	$ 227	$ 894

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