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Details of Certain Balance Sheet Accounts - Accrued Expenses (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Details Of Certain Balance Sheet Accounts [Abstract]    
Health insurance $ 11,200,000us-gaap_AccruedInsuranceCurrent $ 12,200,000us-gaap_AccruedInsuranceCurrent
Workers' compensation 19,800,000us-gaap_WorkersCompensationLiabilityCurrent 16,500,000us-gaap_WorkersCompensationLiabilityCurrent
Legal and other settlements 5,200,000amed_LegalAndOtherSettlements 6,200,000amed_LegalAndOtherSettlements
Lease liability 800,000amed_LeaseLiability 1,800,000amed_LeaseLiability
Charity care 700,000amed_CharityCare 600,000amed_CharityCare
Estimated Medicare CAP liability 2,800,000amed_EstimatedMedicareCapLiability 4,000,000amed_EstimatedMedicareCapLiability
Other 15,800,000us-gaap_OtherAccruedLiabilitiesCurrent 16,300,000us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses $ 56,329,000us-gaap_AccruedLiabilitiesCurrent $ 57,572,000us-gaap_AccruedLiabilitiesCurrent