XML 32 R22.htm IDEA: XBRL DOCUMENT v3.7.0.1

Basis of Presentation and New Accounting Pronouncements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
Basis Of Presentation [Line Items]
Sale of minority interest percentage	75.00%
Unnamed Corporate Joint Venture [Member]
Basis Of Presentation [Line Items]
Equity method ownership percentage in joint venture		37.50%

X

- Definition

Basis Of Presentation [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Sale of minority interest percentage.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=md_UnnamedCorporateJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: