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Income Taxes - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($)
Income Tax Disclosure [Abstract]
Effective income tax rate favorable impact of change in uncertain tax positions	$ 10.6
Decrease in uncertain tax position	$ 17.6

X

- Definition

Unrecognized tax benefits impact effective tax rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	md_
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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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