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Income Taxes - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Sep. 17, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax Credit Carryforward [Line Items]        
Operating Loss Carryforwards Expiration Year   2031    
Payments To Civil Penalty $ 3,700,000med_PaymentsToCivilPenalty      
Operating Loss Carryforwards   10,600,000us-gaap_OperatingLossCarryforwards    
Income Tax Expense (Benefit), Intraperiod Tax Allocation   4,905,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation 9,978,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation 7,400,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation
Maryland State        
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforward, Amount   $ 197,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_StatementGeographicalAxis
= med_MarylandStateMember		    
Tax Credit Carryforward Expiration Year   2018