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Unaudited Summarized Quarterly Financial Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information [Line Items]                      
Net service revenue $ 300,500,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 300,300,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 305,000,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 298,700,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 303,500,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 301,300,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 315,900,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 328,600,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,204,554,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,249,344,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,440,836,000us-gaap_HealthCareOrganizationPatientServiceRevenue
Net income (loss) attributable to Amedisys, Inc. 9,100,000us-gaap_NetIncomeLoss 8,400,000us-gaap_NetIncomeLoss 7,600,000us-gaap_NetIncomeLoss (12,400,000)us-gaap_NetIncomeLoss (9,600,000)us-gaap_NetIncomeLoss (91,100,000)us-gaap_NetIncomeLoss 1,800,000us-gaap_NetIncomeLoss 2,700,000us-gaap_NetIncomeLoss 12,776,000us-gaap_NetIncomeLoss (96,178,000)us-gaap_NetIncomeLoss (83,588,000)us-gaap_NetIncomeLoss
Earnings Per Share Basic $ 0.28us-gaap_EarningsPerShareBasic $ 0.26us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ (0.39)us-gaap_EarningsPerShareBasic $ (0.30)us-gaap_EarningsPerShareBasic $ (2.89)us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 0.09us-gaap_EarningsPerShareBasic $ 0.39us-gaap_EarningsPerShareBasic $ (3.08)us-gaap_EarningsPerShareBasic $ (2.79)us-gaap_EarningsPerShareBasic
Earnings Per Share Diluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ (0.39)us-gaap_EarningsPerShareDiluted $ (0.30)us-gaap_EarningsPerShareDiluted $ (2.89)us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 0.09us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ (3.08)us-gaap_EarningsPerShareDiluted $ (2.79)us-gaap_EarningsPerShareDiluted
Goodwill and other intangibles impairment charge                 3,107,000us-gaap_GoodwillAndIntangibleAssetImpairment 9,492,000us-gaap_GoodwillAndIntangibleAssetImpairment 162,103,000us-gaap_GoodwillAndIntangibleAssetImpairment
Write Off Of Deferred Debt Issuance Cost   500,000us-gaap_WriteOffOfDeferredDebtIssuanceCost                  
Gain (loss) on sale of care centers                 2,967,000us-gaap_GainsLossesOnSalesOfAssets 1,752,000us-gaap_GainsLossesOnSalesOfAssets 0us-gaap_GainsLossesOnSalesOfAssets
U.S. Department of Justice settlement                 0amed_UsDepartmentOfJusticeSettlement 150,000,000amed_UsDepartmentOfJusticeSettlement 0amed_UsDepartmentOfJusticeSettlement
Hospice Inpatient Unit [Member]                      
Quarterly Financial Information [Line Items]                      
Gain (loss) on sale of care centers                 (500,000)us-gaap_GainsLossesOnSalesOfAssets
/ amed_TypeOfBusinessSoldAxis
= amed_HospiceInpatientUnitMember		    
Net Of Tax [Member]                      
Quarterly Financial Information [Line Items]                      
Goodwill and other intangibles impairment charge 600,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		     1,400,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 3,500,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 900,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 1,400,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		        
Exit activity costs       6,100,000us-gaap_RestructuringCharges
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		              
Legal fees       2,400,000us-gaap_LegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 500,000us-gaap_LegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 600,000us-gaap_LegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 1,000,000us-gaap_LegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		 1,200,000us-gaap_LegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		      
Software Write off     900,000us-gaap_CapitalizedComputerSoftwareImpairments
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		                
Write Off Of Deferred Debt Issuance Cost   300,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		                  
Gain (loss) on sale of care centers     1,300,000us-gaap_GainsLossesOnSalesOfAssets
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		                
U.S. Department of Justice settlement           93,900,000amed_UsDepartmentOfJusticeSettlement
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		          
Insurance proceeds for reimbursement of legal fees           3,400,000amed_InsuranceProceedsForReimbursementOfLegalFees
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember		          
Net Of Tax [Member] | Hospice Inpatient Unit [Member]                      
Quarterly Financial Information [Line Items]                      
Gain (loss) on sale of care centers   (300,000)us-gaap_GainsLossesOnSalesOfAssets
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember
/ amed_TypeOfBusinessSoldAxis
= amed_HospiceInpatientUnitMember		                  
Net Of Tax [Member] | OIG Self-Disclosure [Member]                      
Quarterly Financial Information [Line Items]                      
Loss Contingency Accrual     $ 900,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LitigationStatusAxis
= amed_OigSelfDisclosureMember
/ amed_QuarterlyFinancialInformationAxis
= amed_NetOfTaxMember