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Summary of Tax Provision Allocation to Financial Statement Items (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Shedule Of Tax Allocation [Line Items]      
Income from continuing operations $ 10,664,000us-gaap_IncomeTaxExpenseBenefit $ 11,908,000us-gaap_IncomeTaxExpenseBenefit $ 9,914,000us-gaap_IncomeTaxExpenseBenefit
Loss from discontinued operations (5,302,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation (1,690,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation (1,332,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Stockholders' equity, unrealized gain (loss) on investment securities (182,000)med_UnrealizedGainLossOnInvestmentSecuritesIncomeTaxEffect 143,000med_UnrealizedGainLossOnInvestmentSecuritesIncomeTaxEffect 83,000med_UnrealizedGainLossOnInvestmentSecuritesIncomeTaxEffect
Additional paid in capital, share-based compensation tax benefit (275,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation (383,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation (1,265,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Total Income Tax Expense $ 4,905,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation $ 9,978,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation $ 7,400,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation