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Operating Leases - Schedule of lease costs for operating leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating lease costs	$ 30,236
Variable lease costs	4,869
Other equipment rent	2,480
Other operating lease costs	4,578
Total operating lease costs	$ 42,163

X

- Definition

Represents other costs of operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	md_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Other equipment rent.

+ References

No definition available.

+ Details

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X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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