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Goodwill and Other Intangible Assets, Net (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets [Line Items]      
Other intangibles impairment charge $ (3.1)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ (8.2)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ (4.2)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Goodwill impairment loss   (1.3)us-gaap_GoodwillImpairmentLoss (157.9)us-gaap_GoodwillImpairmentLoss
Deferred tax benefit as result of impairment charges     37.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Home Health [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill impairment loss   (1.3)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
(157.9)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Hospice [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill impairment loss   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Equity Method Investments [Member]      
Goodwill and Intangible Assets [Line Items]      
Other intangibles impairment charge     3.1us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
Goodwill impairment loss   1.3us-gaap_GoodwillImpairmentLoss
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
17.4us-gaap_GoodwillImpairmentLoss
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
Care Centers Closed Or Consolidated [Member]      
Goodwill and Intangible Assets [Line Items]      
Other intangibles impairment charge 2.2us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= amed_CareCentersClosedOrConsolidatedMember
3.6us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= amed_CareCentersClosedOrConsolidatedMember
 
Annual Impairment Test Step One [Member]      
Goodwill and Intangible Assets [Line Items]      
Other intangibles impairment charge $ 0.9us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= amed_AnnualImpairmentTestStepOneMember
$ 4.6us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ amed_GoodwillAndIntangibleAssetsImpairmentAxis
= amed_AnnualImpairmentTestStepOneMember