Schedule of Balances Related to Property and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Land	$ 3,200,000us-gaap_Land	$ 3,200,000us-gaap_Land
Building and leasehold improvements	25,300,000amed_BuildingAndLeaseholdImprovements	25,900,000amed_BuildingAndLeaseholdImprovements
Equipment and furniture	97,200,000amed_EquipmentAndFurniture	106,600,000amed_EquipmentAndFurniture
Computer software	158,200,000	153,300,000
Property and Equipment, Gross	283,900,000us-gaap_PropertyPlantAndEquipmentGross	289,000,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	(146,438,000)	(129,891,000)
Property and equipment, net	$ 137,455,000us-gaap_PropertyPlantAndEquipmentNet	$ 159,025,000us-gaap_PropertyPlantAndEquipmentNet

Building And Leasehold Improvements

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- Definition

Equipment And Furniture

+ References

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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