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Accrued Professional Liability - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Payables and Accruals [Abstract]
Total accrued professional liability	$ 168,369,000us-gaap_MalpracticeLossContingencyAccrualUndiscounted	$ 158,691,000us-gaap_MalpracticeLossContingencyAccrualUndiscounted	$ 137,036,000us-gaap_MalpracticeLossContingencyAccrualUndiscounted	$ 122,847,000us-gaap_MalpracticeLossContingencyAccrualUndiscounted
Accrued professional liability incurred but loss reserves not reported for claims	120,600,000us-gaap_SelfInsuranceReserveCurrent	110,300,000us-gaap_SelfInsuranceReserveCurrent
Accrued professional liability incurred and loss reserves reported for claims	$ 47,800,000md_AccruedProfessionalLiability	$ 48,400,000md_AccruedProfessionalLiability

X

- Definition

Accrued professional liability.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the accrued liability on an undiscounted basis for malpractice claims (including general and professional liability) at the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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

X

- Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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