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Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 17, 2012
Dec. 31, 2014
Mar. 10, 2015
Loss Contingencies [Line Items]      
Loss Contingency, Damages Sought, Value   $ 270us-gaap_LossContingencyDamagesSoughtValue  
Payments To Civil Penalty 3.7med_PaymentsToCivilPenalty    
Line of Credit Facility, Expiration Date   Aug. 01, 2015  
First Guarantee [Member]      
Loss Contingencies [Line Items]      
Guarantee Accrued A Charge   2.0med_GuaranteeAccruedCharge
/ us-gaap_DebtInstrumentAxis
= med_FirstGuaranteeMember		  
Long-term Debt, Gross   1.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= med_FirstGuaranteeMember		  
Line of Credit Facility, Current Borrowing Capacity   1.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= med_FirstGuaranteeMember		  
Debt Instrument, Term   2 years  
Debt Instrument, Payment Terms   payment calculations assume a 7 year amortization with a balloon payment due at the end of the term.  
Line of Credit Facility, Description   line of credit has a two year term expiring in September 2015.  
Line of Credit Facility, Expiration Date   Sep. 30, 2015  
Second Guarantee [Member]      
Loss Contingencies [Line Items]      
Debt Instrument Outstanding Loan     0.1med_DebtInstrumentOutstandingLoan
/ us-gaap_DebtInstrumentAxis
= med_SecondGuaranteeMember
Long-term Debt, Gross   $ 1.4us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= med_SecondGuaranteeMember		  
Debt Instrument, Term   2 years  
Debt Instrument, Payment Terms   payment calculations assume a 7 year amortization with a balloon payment due at the end of the term.