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Schedule of Balances Related to Property and Equipment (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Abstract]    
Land $ 3,200,000us-gaap_Land $ 3,200,000us-gaap_Land
Building and leasehold improvements 25,300,000amed_Buildingandleaseholdimprovements 25,300,000amed_Buildingandleaseholdimprovements
Equipment and furniture 97,200,000amed_Equipmentandfurniture 97,200,000amed_Equipmentandfurniture
Computer software 82,700,000us-gaap_CapitalizedComputerSoftwareGross 158,200,000us-gaap_CapitalizedComputerSoftwareGross
Property and Equipment, Gross 208,400,000us-gaap_PropertyPlantAndEquipmentGross 283,900,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (151,311,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (146,438,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 57,088,000us-gaap_PropertyPlantAndEquipmentNet $ 137,455,000us-gaap_PropertyPlantAndEquipmentNet