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Accounts Payable and Accrued Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Net decrease in accrued salaries and bonuses	$ 150.8md_IncreaseDecreaseInAccruedPayrollTaxesAndBenefits

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- Definition

Increase decrease in accrued payroll taxes and benefits.

+ References

No definition available.

+ Details

Name:	md_IncreaseDecreaseInAccruedPayrollTaxesAndBenefits
Namespace Prefix:	md_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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