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Basis of Presentation and New Accounting Pronouncements - Additional Information (Detail)	Sep. 30, 2016
Variable Interest Entity, Primary Beneficiary [Member]
Basis Of Presentation [Line Items]
Consolidation method ownership percentage in joint venture	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

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Namespace Prefix:	md_
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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

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Details

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