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Accounts Payable and Accrued Expenses - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Payables and Accruals [Abstract]
Net decrease in accrued salaries and bonuses	$ 31.0

X

- 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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- References

No definition available.

+ Details

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