XML 78 R65.htm IDEA: XBRL DOCUMENT v3.22.0.1

Line of Credit, Long-Term Debt and Finance Lease Obligations - Summary of Estimated Fair Value of Notes (Detail) - Level 2 [Member] - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
5.25% Senior Unsecured Notes Due 2023 [Member]
Debt Instrument Fair Value [Line Items]
Estimated fair value	$ 0	$ 756,225
6.25% Senior Unsecured Notes Due 2027 [Member]
Debt Instrument Fair Value [Line Items]
Estimated fair value	$ 1,047,190	$ 1,070,000

X

- Definition

Debt Instrument Fair Value [Line Items]

+ References

No definition available.

+ Details

Name:	md_DebtInstrumentFairValueLineItems
Namespace Prefix:	md_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_NotesPayableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CreditFacilityAxis=md_FivePointTwoFivePercentSeniorUnsecuredNotesDueTwoThousandTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=md_SixPointTwoFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: