XML 11 R27.htm IDEA: XBRL DOCUMENT v3.20.1

Coronavirus Pandemic ("COVID-19") - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended
	Mar. 27, 2020	Mar. 25, 2020	Mar. 31, 2020	Apr. 01, 2020
Senior Unsecurd Notes 2023 [Member]
Debt Instrument Interest Rate			5.25%
Senior Unsecurd Notes 2027 [Member]
Debt Instrument Interest Rate			6.25%
Forecast For Second And Third Quarters Of 2020 [Member] | Credit Agreement [Member]
Estimated EBITDA		$ 139.2
Forecast For Second And Third Quarters Of 2020 [Member] | Credit Agreement [Member] | Maximum [Member]
Leverage ratio		5.00:1:00
Forecast For Second And Third Quarters Of 2020 [Member] | Credit Agreement [Member] | Minimum [Member]
Leverage ratio		4.50:1:00
Forecast For Fourth Quarter Of 2020 [Member] | Credit Agreement [Member]
Leverage ratio		4.75:1:00
Forecast For First Quarter Of 2021 [Member] | Credit Agreement [Member]
Leverage ratio		2020
Forecast For Second Quarter Of 2021 [Member] | Credit Agreement [Member]
Credit Facility Borrowing Capacity		$ 300.0
COVID-19 [Member]
Reimbursement of Lost Revenue	$ 100.0
Proceeds From Contribution In Aid Of Reimbursement of Lost Revenue				$ 12.2
Deferred Payment Of Social Security Taxes | %	50.00%
COVID-19 [Member] | Urban Area [Member]
Reimbursement of Lost Revenue				30.0
COVID-19 [Member] | Rural Area [Member]
Reimbursement of Lost Revenue				$ 70.0
COVID-19 [Member] | Executive Officer [Member]
Decrease In Salary | %			50.00%

X

- Definition

Contributions In Aid Of Reimbursement of Lost Revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Estimated Earnings Before Interest Taxes Depreciation And Amortization

+ References

No definition available.

+ Details

Name:	md_EstimatedEarningsBeforeInterestTaxesDepreciationAndAmortization
Namespace Prefix:	md_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage Increase Decrease In Salary And Wage.

+ References

No definition available.

+ Details

Name:	md_PercentageIncreaseDecreaseInSalaryAndWage
Namespace Prefix:	md_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of Deferred Payment Of Social Security Taxes.

+ References

No definition available.

+ Details

Name:	md_PercentageOfDeferredPaymentOfSocialSecurityTaxes
Namespace Prefix:	md_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Proceeds From Contribution In Aid Of Reimbursement of Lost Revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Supplementary Leverage Ratio Required.

+ References

No definition available.

+ Details

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

X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=md_Seniorunsecurdnotes2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=md_Seniorunsecurdnotes2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=md_ForecastForSecondAndThirdQuartersOf2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=md_ForecastForFourthQuarterOf2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=md_ForecastForFirstQuarterOf2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=md_ForecastForSecondQuarterOf2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	md_ExtraordinaryItemsAxis=md_CovidNinenteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=md_UrbanAreaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=md_RuralAreaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: