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Employee Benefit Plans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Y
Dec. 31, 2013
Dec. 31, 2012
Pension and Other Postretirement Benefits Disclosure [Abstract]      
Minimum Eligible Age For Employees To Contribute To Benefit Plan 21amed_MinimumEligibleAgeForEmployeesToContributeToBenefitPlan    
Employer Match Amount $ 0.375amed_DefinedContributionPlanEmployerMatchingContribution $ 0.375amed_DefinedContributionPlanEmployerMatchingContribution $ 0.375amed_DefinedContributionPlanEmployerMatchingContribution
Employee Contribution Amount 1.00amed_DefinedContributionPlanEmployeeContributionForEmployeeMatchingProgram 1.00amed_DefinedContributionPlanEmployeeContributionForEmployeeMatchingProgram 1.00amed_DefinedContributionPlanEmployeeContributionForEmployeeMatchingProgram
Maximum Percentage of Employee Salary Eligible for Employer Match 6.00%amed_DefindContributionPlanMaximumAnnualMatchPerEmployeeSalaryPercentage 6.00%amed_DefindContributionPlanMaximumAnnualMatchPerEmployeeSalaryPercentage 6.00%amed_DefindContributionPlanMaximumAnnualMatchPerEmployeeSalaryPercentage
401 (k) Expense Recognized by Company $ 6,200,000us-gaap_DefinedContributionPlanCostRecognized $ 7,800,000us-gaap_DefinedContributionPlanCostRecognized $ 9,700,000us-gaap_DefinedContributionPlanCostRecognized
Permitted deferment of annual salary, percentage 75.00%amed_DeferredCompensationArrangementMaximumPercentageOfSalaryDeferment    
Permitted deferment of annual bonus, percentage 100.00%amed_DeferredCompensationArrangementMaximumPercentageOfAnnualBonusDeferment